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Have you found any 128bit math library in good shape?

No not yet. I assumed that they would exist, but so far all I've found is 128-bit FP and arbitrary precision integer:(

building a Math::Int128 module using Math::Int64 as a base

That was my thought also.

Just point me to the library and I will do it!

That's an offer I cannot pass up. Thank you.

From what I've seen so far, I'll end up having to write the C library myself.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

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