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The necessary functions are copied from cpython 3.12
Include/internal/pycore_long.h
, which is private. This should make it easy to copy new versions if cpython internals change. For cpython < 3.12 I implemented equivalent functions.All of this is placed in separate files
pycore_long.pxd
andpycore_long.h
copied from sagemath/cypari2#137.Tested in 64-bit and 32-bit x86.
Fixes: #246