5 files changed, 243 insertions, 51 deletions

diff --git a/packages/utils/test/abi_encoder/evm_data_types_test.ts b/packages/utils/test/abi_encoder/evm_data_types_test.ts
index 55d582d10..4faa5a21f 100644
--- a/packages/utils/test/abi_encoder/evm_data_types_test.ts
+++ b/packages/utils/test/abi_encoder/evm_data_types_test.ts
@@ -26,6 +26,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Dynamic size; Static elements', async () => {
             // Create DataType object
@@ -41,6 +45,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Fixed size; Dynamic elements', async () => {
             // Create DataType object
@@ -56,6 +64,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Dynamic size; Dynamic elements', async () => {
             // Create DataType object
@@ -71,6 +83,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Dynamic Size; Multidimensional; Dynamic Elements', async () => {
             // Create DataType object
@@ -89,6 +105,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Dynamic Size; Multidimensional; Static Elements', async () => {
             // Create DataType object
@@ -107,6 +127,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Static Size; Multidimensional; Static Elements', async () => {
             // Create DataType object
@@ -124,6 +148,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Static Size; Multidimensional; Dynamic Elements', async () => {
             // Create DataType object
@@ -141,6 +169,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Static size; Too Few Elements', async () => {
             // Create DataType object
@@ -197,6 +229,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args, encodingRules);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Dynamic elements only', async () => {
             // Create DataType object
@@ -217,6 +253,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Nested Static Array', async () => {
             // Create DataType object
@@ -237,6 +277,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Nested Dynamic Array', async () => {
             // Create DataType object
@@ -257,6 +301,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Nested Static Multidimensional Array', async () => {
             // Create DataType object
@@ -279,6 +327,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Nested Dynamic Multidimensional Array', async () => {
             // Create DataType object
@@ -301,6 +353,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Static and dynamic elements mixed', async () => {
             // Create DataType object
@@ -331,6 +387,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodingRules: AbiEncoder.DecodingRules = { shouldConvertStructsToObjects: true };
             const decodedArgs = dataType.decode(encodedArgs, decodingRules);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Missing Key', async () => {
             // Create DataType object
@@ -345,22 +405,22 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Encode Args and validate result
             expect(() => {
                 dataType.encode(args, encodingRules);
-            }).to.throw('Could not assign tuple to object: missing keys field_2');
+            }).to.throw('Could not assign tuple to object: missing key \'field_2\' in object {"field_1":"-5"}');
         });
         it('Bad Key', async () => {
             // Create DataType object
             const testDataItem = {
                 name: 'Tuple',
                 type: 'tuple',
-                components: [{ name: 'field_1', type: 'int32' }, { name: 'field_2', type: 'bool' }],
+                components: [{name: 'field_1', type: 'bool' }],
             };
             const dataType = new AbiEncoder.Tuple(testDataItem);
             // Construct args to be encoded
-            const args = { unknown_field: new BigNumber(-5) };
+            const args = { field_1: true, unknown_field: new BigNumber(-5) };
             // Encode Args and validate result
             expect(() => {
                 dataType.encode(args, encodingRules);
-            }).to.throw("Could not assign tuple to object: unrecognized key 'unknown_field' in object Tuple");
+            }).to.throw("Could not assign tuple to object: unrecognized keys unknown_field");
         });
     });
 
@@ -378,6 +438,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Invalid Address - input is not valid hex', async () => {
             // Create DataType object
@@ -417,6 +481,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('False', async () => {
             // Create DataType object
@@ -431,6 +499,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
     });
 
@@ -455,6 +527,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int256 - Negative Base Case', async () => {
             // Create DataType object
@@ -469,6 +545,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int256 - Positive Value', async () => {
             // Create DataType object
@@ -483,6 +563,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int256 - Negative Value', async () => {
             // Create DataType object
@@ -497,6 +581,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int256 - Value too large', async () => {
             // Create DataType object
@@ -533,6 +621,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int32 - Negative Base Case', async () => {
             // Create DataType object
@@ -547,6 +639,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int32 - Positive Value', async () => {
             // Create DataType object
@@ -561,6 +657,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int32 - Negative Value', async () => {
             // Create DataType object
@@ -575,6 +675,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Int32 - Value too large', async () => {
             // Create DataType object
@@ -621,6 +725,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('UInt256 - Positive Value', async () => {
             // Create DataType object
@@ -635,6 +743,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('UInt256 - Zero Value', async () => {
             // Create DataType object
@@ -649,6 +761,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('UInt256 - Value too large', async () => {
             // Create DataType object
@@ -685,6 +801,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('UInt32 - Positive Value', async () => {
             // Create DataType object
@@ -699,6 +819,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('UInt32 - Zero Value', async () => {
             // Create DataType object
@@ -713,6 +837,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('UInt32 - Value too large', async () => {
             // Create DataType object
@@ -752,6 +880,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Single Byte (bytes1)', async () => {
             // Create DataType object
@@ -766,6 +898,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('4 Bytes (bytes4)', async () => {
             // Create DataType object
@@ -780,6 +916,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('4 Bytes (bytes4); Encoder must pad input', async () => {
             // Create DataType object
@@ -796,6 +936,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodedArgs = dataType.decode(encodedArgs);
             const paddedArgs = '0x1a180000';
             expect(decodedArgs).to.be.deep.equal(paddedArgs);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('32 Bytes (bytes32)', async () => {
             // Create DataType object
@@ -810,6 +954,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('32 Bytes (bytes32); Encoder must pad input', async () => {
             // Create DataType object
@@ -826,6 +974,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             const decodedArgs = dataType.decode(encodedArgs);
             const paddedArgs = '0x1a18bf6100000000000000000000000000000000000000000000000000000000';
             expect(decodedArgs).to.be.deep.equal(paddedArgs);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Should throw when pass in too many bytes (bytes4)', async () => {
             // Create DataType object
@@ -893,6 +1045,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Spans multiple EVM words', async () => {
             // Create DataType object
@@ -910,6 +1066,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Input as Buffer', async () => {
             // Create DataType object
@@ -927,6 +1087,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Should throw when pass in bad hex (no 0x prefix)', async () => {
             // Create DataType object
@@ -968,6 +1132,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('Spans multiple EVM words', async () => {
             // Create DataType object
@@ -985,6 +1153,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
         it('String that begins with 0x prefix', async () => {
             // Create DataType object
@@ -1002,6 +1174,10 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
             // Decode Encoded Args and validate result
             const decodedArgs = dataType.decode(encodedArgs);
             expect(decodedArgs).to.be.deep.equal(args);
+            // Validate signature
+            const dataTypeFromSignature = AbiEncoder.fromSignature(dataType.getSignature(true));
+            const encodedArgsFromSignature = dataTypeFromSignature.encode(args);
+            expect(encodedArgsFromSignature).to.be.deep.equal(expectedEncodedArgs);
         });
     });
 });
diff --git a/packages/utils/test/abi_encoder/methods_test.ts b/packages/utils/test/abi_encoder/methods_test.ts
index a0525967e..684d7c4b3 100644
--- a/packages/utils/test/abi_encoder/methods_test.ts
+++ b/packages/utils/test/abi_encoder/methods_test.ts
@@ -21,7 +21,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x09f2b0c30000000000000000000000000000000000000000000000000000000000000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff560000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000000000000000000000000000000000000000000000000000000000015600000000000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Array of Static Tuples (Array has defined length)', async () => {
@@ -40,7 +41,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x9eb20969000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000010';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Array of Static Tuples (Array has dynamic length)', async () => {
@@ -59,7 +61,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x63275d6e00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000010';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Array of Dynamic Tuples (Array has defined length)', async () => {
@@ -78,7 +81,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0xdeedb00f00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000018000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000280000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000003800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000048000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000013400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000001360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000138000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023130000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023134000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023136000000000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Array of Dynamic Tuples (Array has dynamic length)', async () => {
@@ -97,7 +101,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x60c847fb000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000018000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000280000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000003800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000048000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000013400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000500000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000001360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000138000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023130000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023132000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023134000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000023136000000000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Multidimensional Arrays / Static Members', async () => {
@@ -109,8 +114,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
         const argsLength = 8;
         for (let i = 0; i < argsLength; ++i) {
             args.push([
-                [[new BigNumber(++value), new BigNumber(++value)], [new BigNumber(++value), new BigNumber(++value)]],
-                [[new BigNumber(++value), new BigNumber(++value)], [new BigNumber(++value), new BigNumber(++value)]],
+                [[++value, ++value], [++value, ++value]],
+                [[++value, ++value], [++value, ++value]],
             ]);
         }
         const calldata = method.encode(args, encodingRules);
@@ -118,9 +123,9 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
         const expectedCalldata =
             '0xc2f47d6f00000000000000000000000000000000000000000000000000000000000001e00000000000000000000000000000000000000000000000000000000000000480000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000d400000000000000000000000000000000000000000000000000000000000000e600000000000000000000000000000000000000000000000000000000000000039000000000000000000000000000000000000000000000000000000000000003a000000000000000000000000000000000000000000000000000000000000003b000000000000000000000000000000000000000000000000000000000000003c000000000000000000000000000000000000000000000000000000000000003d000000000000000000000000000000000000000000000000000000000000003e000000000000000000000000000000000000000000000000000000000000003f00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000130000000000000000000000000000000000000000000000000000000000000014000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000001500000000000000000000000000000000000000000000000000000000000000160000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000001700000000000000000000000000000000000000000000000000000000000000180000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000019000000000000000000000000000000000000000000000000000000000000001a000000000000000000000000000000000000000000000000000000000000001b000000000000000000000000000000000000000000000000000000000000001c0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000001d000000000000000000000000000000000000000000000000000000000000001e000000000000000000000000000000000000000000000000000000000000001f000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000210000000000000000000000000000000000000000000000000000000000000022000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000230000000000000000000000000000000000000000000000000000000000000024000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000025000000000000000000000000000000000000000000000000000000000000002600000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000027000000000000000000000000000000000000000000000000000000000000002800000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000029000000000000000000000000000000000000000000000000000000000000002a000000000000000000000000000000000000000000000000000000000000002b000000000000000000000000000000000000000000000000000000000000002c000000000000000000000000000000000000000000000000000000000000002d000000000000000000000000000000000000000000000000000000000000002e000000000000000000000000000000000000000000000000000000000000002f0000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000003100000000000000000000000000000000000000000000000000000000000000320000000000000000000000000000000000000000000000000000000000000033000000000000000000000000000000000000000000000000000000000000003400000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000035000000000000000000000000000000000000000000000000000000000000003600000000000000000000000000000000000000000000000000000000000000370000000000000000000000000000000000000000000000000000000000000038';
         expect(calldata).to.be.equal(expectedCalldata);
-        expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Multidimensional Arrays / Dynamic Members', async () => {
@@ -148,7 +153,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x81534ebd0000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000052000000000000000000000000000000000000000000000000000000000000009a00000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000260000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000131000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001320000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000013300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000134000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000001350000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000137000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001380000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000260000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000139000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002313000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000023131000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000231320000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000002313300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000023134000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000231350000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002313600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000024000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000231370000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002313800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000023139000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000232300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000023231000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000232320000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000002323300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000023234000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000232350000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002323600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000232370000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002323800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000002323900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000023330000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000002333100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000023332000000000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Fixed Length Array / Dynamic Members', async () => {
@@ -161,7 +167,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x243a6e6e0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000005427261766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034e657700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Fixed Length Array / Dynamic Members', async () => {
@@ -174,7 +181,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x243a6e6e0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000005427261766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034e657700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Unfixed Length Array / Dynamic Members ABI', async () => {
@@ -187,33 +195,36 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x13e751a900000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000005427261766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034e657700000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Unfixed Length Array / Static Members ABI', async () => {
         // Generate calldata
         const method = new AbiEncoder.Method(AbiSamples.dynamicArrayStaticMembersAbi);
-        const args = [[new BigNumber(127), new BigNumber(14), new BigNumber(54)]];
+        const args = [[127, 14, 54]];
         const calldata = method.encode(args, encodingRules);
         // Validate calldata
         const expectedCalldata =
             '0x4fc8a83300000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000007f000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000036';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Fixed Length Array / Static Members ABI', async () => {
         // Generate calldata
         const method = new AbiEncoder.Method(AbiSamples.staticArrayAbi);
-        const args = [[new BigNumber(127), new BigNumber(14), new BigNumber(54)]];
+        const args = [[127, 14, 54]];
         const calldata = method.encode(args, encodingRules);
         // Validate calldata
         const expectedCalldata =
             '0xf68ade72000000000000000000000000000000000000000000000000000000000000007f000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000000000036';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Array ABI', async () => {
@@ -226,7 +237,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x13e751a900000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000373697800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005736576656e000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Static Tuple', async () => {
@@ -240,7 +252,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0xa9125e150000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Dynamic Tuple (Array input)', async () => {
@@ -254,7 +267,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x5b998f3500000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Dynamic Tuple (Object input)', async () => {
@@ -268,7 +282,8 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '0x5b998f3500000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000046669766500000000000000000000000000000000000000000000000000000000';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Large, Flat ABI', async () => {
@@ -291,13 +306,14 @@ describe('ABI Encoder: Method Encoding / Decoding', () => {
             '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';
         expect(calldata).to.be.equal(expectedCalldata);
         // Validate decoding
-        const decodedValue = method.decode(calldata);
+        const decodingRules = {structsAsObjects: false};
+        const decodedValue = method.decode(calldata, decodingRules);
         expect(decodedValue).to.be.deep.equal(args);
     });
     it('Large, Nested ABI', async () => {
         // Construct Calldata
         const method = new AbiEncoder.Method(AbiSamples.largeNestedAbi);
-        const someStaticArray = [new BigNumber(127), new BigNumber(14), new BigNumber(54)];
+        const someStaticArray = [127, 14, 54];
         const someStaticArrayWithDynamicMembers = [
             'the little piping piper piped a piping pipper papper',
             'the kid knows how to write poems, what can I say -- I guess theres a lot I could say to try to fill this line with a lot of text.',
diff --git a/packages/utils/test/abi_encoder/optimizer_test.ts b/packages/utils/test/abi_encoder/optimizer_test.ts
index ee0654ec3..ac8999168 100644
--- a/packages/utils/test/abi_encoder/optimizer_test.ts
+++ b/packages/utils/test/abi_encoder/optimizer_test.ts
@@ -23,7 +23,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x7221063300000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000640000000000000000000000000000000000000000000000000000000000000096';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Dynamic Arrays with Dynamic Elements', async () => {
@@ -38,7 +38,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0xbb4f12e300000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Static Arrays with Static Elements (should not optimize)', async () => {
@@ -55,7 +55,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
         const unoptimizedCalldata = method.encode(args);
         expect(optimizedCalldata).to.be.equal(unoptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Static Arrays with Dynamic Elements', async () => {
@@ -70,7 +70,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x9fe31f8e0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Array Elements (should optimize)', async () => {
@@ -84,7 +84,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x13e751a900000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Tuple Fields', async () => {
@@ -98,7 +98,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x16780a5e000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000548656c6c6f000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Strings', async () => {
@@ -115,7 +115,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x07370bfa00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000548656c6c6f000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Bytes', async () => {
@@ -133,7 +133,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x6045e42900000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002801020304050607080910111213141516171819202122232425262728293031323334353637383940000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Tuples', async () => {
@@ -148,7 +148,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x564f826d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000006792a000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20576f726c642100000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Fields Across Two Tuples', async () => {
@@ -164,7 +164,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x564f826d000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000d48656c6c6f2c20576f726c642100000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Arrays, Nested in Separate Tuples', async () => {
@@ -180,7 +180,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x18970a9e000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000064000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000c80000000000000000000000000000000000000000000000000000000000000035657874726120617267756d656e7420746f2070726576656e742065786163746c79206d61746368696e6720746865207475706c65730000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Tuples, Nested in Separate Tuples', async () => {
@@ -196,7 +196,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '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';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Two-Dimensional Arrays', async () => {
@@ -211,7 +211,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x0d28c4f9000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000002c0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000003466f6f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003426172000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035a61610000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000003466f6f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003426172000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035a61610000000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Duplicate Array, Nested within Separate Two-Dimensional Arrays', async () => {
@@ -226,14 +226,14 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x0d28c4f900000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000001200000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003466f6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c640000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000034261720000000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Array Elements Duplicated as Tuple Fields', async () => {
         // Generate calldata
         const method = new AbiEncoder.Method(OptimizedAbis.arrayElementsDuplicatedAsTupleFields);
-        const array = [new BigNumber(100), new BigNumber(150), new BigNumber(200), new BigNumber(225)];
-        const tuple = [[array[0]], [array[1]], [array[2]], [array[3]]];
+        const array = [100, 150, 200, 225];
+        const tuple = [[new BigNumber(array[0])], [new BigNumber(array[1])], [new BigNumber(array[2])], [new BigNumber(array[3])]];
         const args = [array, tuple];
         // Validata calldata
         const optimizedCalldata = method.encode(args, encodingRules);
@@ -241,7 +241,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0x5b5c78fd0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000064000000000000000000000000000000000000000000000000000000000000009600000000000000000000000000000000000000000000000000000000000000c800000000000000000000000000000000000000000000000000000000000000e1';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
     it('Array Elements Duplicated as Separate Parameter', async () => {
@@ -256,7 +256,7 @@ describe('ABI Encoder: Optimized Method Encoding/Decoding', () => {
             '0xe0e0d34900000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000548656c6c6f000000000000000000000000000000000000000000000000000000';
         expect(optimizedCalldata).to.be.equal(expectedOptimizedCalldata);
         // Validate decoding
-        const decodedArgs = method.decode(optimizedCalldata);
+        const decodedArgs = method.decode(optimizedCalldata, {structsAsObjects: false});
         expect(decodedArgs).to.be.deep.equal(args);
     });
 });
diff --git a/packages/utils/test/abi_encoder/return_values_test.ts b/packages/utils/test/abi_encoder/return_values_test.ts
index 104c7f5db..b5b9dfd64 100644
--- a/packages/utils/test/abi_encoder/return_values_test.ts
+++ b/packages/utils/test/abi_encoder/return_values_test.ts
@@ -15,7 +15,7 @@ describe('ABI Encoder: Return Value Encoding/Decoding', () => {
         // Decode return value
         const method = new AbiEncoder.Method(ReturnValueAbis.noReturnValues);
         const returnValue = '0x';
-        const decodedReturnValue = method.decodeReturnValues(returnValue);
+        const decodedReturnValue = method.decodeReturnValues(returnValue, {structsAsObjects: false});
         const expectedDecodedReturnValue: any[] = [];
         expect(decodedReturnValue).to.be.deep.equal(expectedDecodedReturnValue);
     });
@@ -24,7 +24,7 @@ describe('ABI Encoder: Return Value Encoding/Decoding', () => {
         const method = new AbiEncoder.Method(ReturnValueAbis.singleStaticReturnValue);
         const returnValue = ['0x01020304'];
         const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
-        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue, {structsAsObjects: false});
         // Validate decoded return value
         expect(decodedReturnValue).to.be.deep.equal(returnValue);
     });
@@ -33,7 +33,7 @@ describe('ABI Encoder: Return Value Encoding/Decoding', () => {
         const method = new AbiEncoder.Method(ReturnValueAbis.multipleStaticReturnValues);
         const returnValue = ['0x01020304', '0x05060708'];
         const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
-        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue, {structsAsObjects: false});
         // Validate decoded return value
         expect(decodedReturnValue).to.be.deep.equal(returnValue);
     });
@@ -42,7 +42,7 @@ describe('ABI Encoder: Return Value Encoding/Decoding', () => {
         const method = new AbiEncoder.Method(ReturnValueAbis.singleDynamicReturnValue);
         const returnValue = ['0x01020304'];
         const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
-        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue, {structsAsObjects: false});
         // Validate decoded return value
         expect(decodedReturnValue).to.be.deep.equal(returnValue);
     });
@@ -51,7 +51,7 @@ describe('ABI Encoder: Return Value Encoding/Decoding', () => {
         const method = new AbiEncoder.Method(ReturnValueAbis.multipleDynamicReturnValues);
         const returnValue = ['0x01020304', '0x05060708'];
         const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
-        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue, {structsAsObjects: false});
         // Validate decoded return value
         expect(decodedReturnValue).to.be.deep.equal(returnValue);
     });
@@ -60,7 +60,7 @@ describe('ABI Encoder: Return Value Encoding/Decoding', () => {
         const method = new AbiEncoder.Method(ReturnValueAbis.mixedStaticAndDynamicReturnValues);
         const returnValue = ['0x01020304', '0x05060708'];
         const encodedReturnValue = method.encodeReturnValues(returnValue, encodingRules);
-        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue);
+        const decodedReturnValue = method.decodeReturnValues(encodedReturnValue, {structsAsObjects: false});
         // Validate decoded return value
         expect(decodedReturnValue).to.be.deep.equal(returnValue);
     });
diff --git a/packages/utils/test/abi_encoder/signature_tests.ts b/packages/utils/test/abi_encoder/signature_tests.ts
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/packages/utils/test/abi_encoder/signature_tests.ts