See also Binary math - Binary (base 2, Boolean) math

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p5-Set-IntSpan-1.07 Manages sets of integers

Set::IntegerFast - Manages sets of integers, with an eye toward efficiency. Ideal for computing unions, intersections, and so on. [Perl] {oss}

Set::Scalar - Manages sets of scalars, with an eye toward programmer comfort instead of efficiency. [Perl] {oss}

Tie::IxHash - Now your hashes can remember the order in which elements were added. See the tie() function. ./docs/manual/html/perltie.html. [Perl] {oss}

String::BitCount - Count the number of 1 ("on") bits in a string. [Perl] {oss}