Which strongly suggests that the cause is one of the many possible binary modules (Math::BigInt::BitVect, Math::BigInt::Pari and Math::BigInt::GMP.) that can sit behind use bignum doesn't properly handle log.

If you could dump your %INC, maybe we could track down which one(s).

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.

In reply to Re^2: What causes NaN when using bignum by BrowserUk
in thread What causes NaN when using bignum by Microcebus

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