... but it might use perl -V:ivsize instead...

Yes, "ivsize" is what you need to look at. That tells you how many bytes there are in the signed and unsigned perl integers (IV and UV).
"intsize" merely tells you the number of bytes in the C "int" for the compiler that built perl, and that is commonly less than the number of bytes in the perl integer.

Cheers,
Rob

In reply to Re^3: modulo 1 (%1) and fractional part of a number by syphilis
in thread modulo 1 (%1) and fractional part of a number by JBCookin

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