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gh-143050: Correct PyLong_FromString() to use _PyLong_Negate() (GH-145901) The long_from_string_base() might return a small integer, when the _pylong.py is used to do conversion. Hence, we must be careful here to not smash it "small int" bit by using the _PyLong_FlipSign(). (cherry picked from commit db5936c5b89aa19e04d63120e0cf5bbc73bf2420) Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com> Co-authored-by: Victor Stinner <vstinner@python.org>