Ok, I know it said "pure perl", but in case you are looking for a decent C implementation for Perl, look at Math::BigGMP. It's a drop in replacement for Math::BigInt.. Just throwing options for "related" questions..

In reply to Re: Re: pure perl + large integers + bitsets = dilemma by dextius
in thread pure perl + large integers + bitsets = dilemma by wufnik

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