Adopt a consistent POSIX layout

Feature or enhancement

Proposal:

Currently, the Python installation directory for stdlib/platstdlib and purelib/platlib is defined as {implementation_lower}{py_version_short}{abi_thread}, and for include/platinclude as {implementation_lower}{py_version_short}{abiflags}.

I would like to make it consistent with {implementation_lower}{py_version_short}{abiflags}.

Currently, I believe this will mostly affect debug builds, which will receive their own separate directory.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

In https://github.com/python/cpython/issues/121103, we added {abi_thread}.
In https://github.com/python/cpython/issues/127294, we discuss some of the impact of mixed installations.

まず issues 121103 と 127294 の議論を確認し、次に stdlib、platstdlib、purelib、platlib、include、platinclude のインストールパスがどのように定義されているかを追跡します。debug インストールと混在インストールへの影響を確認します。対象となるパスが、これらのケースを壊すことなく一貫して {implementation_lower}{py_version_short}{abiflags} を使用すれば完了です。