- Use "Math::Prime::Util::GMP::moebius(from, to)" in Number `_squarefree_sieve(from, to)`.
- Use "Math::Prime::Util::GMP::moebius(from, to)" in Number `_squarefree_sieve(from, to)`.

Improves the performance a little bit when Math::Prime::Util is not installed, or when `to` is greater than a ULONG_MAX.

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