gh-123497: New limit for Python integers on 64-bit platforms (signed) #123724
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Instead of be limited just by the size of addressable memory (2**63 bytes), Python integers are now also limited by the number of bits, so the number of bit now always fits in 64-bit integer.
Both limits are much larger than what can be available on practice, so there is no effect on users.
_PyLong_NumBits() and _PyLong_Frexp() are now always successful.