That's why I asked up front about a 128-bit math package, not an infinite precision math package

Understood. At no stage was it was my intention to suggest that you should use Math::GMPz instead of Math::Int128 - I was merely querying the speed of Math::Int128 (whose basic math operations seem to be about 3 times slower than need be), and using Math::GMPz for benchmark comparisons.

And why I tried really hard to avoid this debate

Apologies for my part in forcing that upon you - though that was never my intention. (I know very well how annoying it is to be taken to task over matters that are irrelevant to the task at hand.)

Cheers,
Rob

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