Asdiscussed on C API WG, formally soft-deprecate outdated macros:

• Py_LL &Py_ULL: UseLL/ULL suffixes.
• Py_MEMCPY (already soft-deprecated)
• Py_VA_COPY: Useva_copy directly.
• PY_LONG_LONG,PY_LLONG_MIN,PY_LLONG_MAX,PY_ULLONG_MAX,PY_INT32_T,PY_UINT32_T,PY_INT64_T,PY_UINT64_T,PY_SIZE_MAX: Use C99 types/limits
• Py_UNICODE_SIZE: Usesizeof(wchar_t) directly
• PY_FORMAT_SIZE_T: Use"z" directly
• Py_ALIGNED: Use_Alignas (C11) oralignas (C++ & C23) instead.

PlusPy_UNICODE_WIDE: soft-deprecate this instead of removing. (There's been no visible warning outside docs, and removing an#ifdef macro is indistinguishable from making it “false”.)

Linked PRs

• gh-146175: Soft-deprecate outdated macros; convert internal usage #146178