Binary_search implements a generic binary search algorithm returning the
position of the first record whose index value is greater than or equal
to $val. The search routine does not define any of the terms position,
record or index value, but leaves their interpretation and
implementation to the user supplied function &$read(). The only
restriction is that positions must be integer scalars.
WWW: http://search.cpan.org/dist/Search-Binary/
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