Math::BigInt(::FastCalc) numifies values as an NV:

That would account for a loss of precision, but it shouldn't result in -1.

SvUV() silently mangles NVs > 2**53

Are you sure? The number the OP posted requires 56 bits of precision to be stored in a float (64 bits for an integer). One would think the value was already mangled.

but whther it is compiled in or not is dependant upon another #define

CAST_INLINE only determines if the cast is done inline or if a subroutine is called to do the cast. Or where you referring to some unshown #ifdef?

In reply to Re^3: 64 bit integers woes by ikegami
in thread 64 bit integers woes by semuel

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