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Incompatibility with Python 3.12 #246

@encukou

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@encukou

Python 3.12 changes the internal representation of int objects (to speed up common cases). Usage of Py_SIZE and ob_digit in gmp/pylong.pyx will fail.

The supported way of extracting the value of integers (if they don't fit in a C long long) is the Python method to_bytes, and there's from_bytes to go back. (If this is too slow for fpylll, please chime in in the discussion.)

(edit) See also: python/cpython#101292

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