The thing is I can't see any different between the two by looking at them using sprintf or pack 'd'.

That's because sprintf and pack first convert the uint64 into an NV implicitly.

On the other hand, is converts its operands into strings and compares them. The NV is represented in scientific notation and the uint64 in decimal and so they differ.

In reply to Re^2: supporting quads on 32 bit Perl (0.23) by salva
in thread supporting quads on 32 bit Perl by bulk88

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