Internally an IV does not need to be mapped to an int, but it might be a long or even long long

Indeed. I'd go further and speculate that an IV is mapped to a long or long long on almost all 64-bit platforms because the two overwhelmingly dominant 64-bit programming models (LP64 and LLP64) both use 32-bit ints. That is, I'd expect to see: 

intsize='4';
ivsize='8';

[download]
on just about every 64-bit Perl.

I remember this from a fascinating thread a few months back, where syphilis noted he's "never struck a perl where $Config{intsize} != 4".

In reply to Re^2: Best way to check for 64-bit support by eyepopslikeamosquito
in thread Best way to check for 64-bit support by gflohr

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