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> The functionality looks a bit cryptic to me. What is the use case?
Serializing filter specifiers for custom file formats. The particular
case that prompted adding the code is zipfile (issue 14366).
I've added a note to the docs and docstrings explaining this.
> I wonder if Py_LONG_LONG is always defined (although it certainly is on major platforms).
I expect it will always be defined on platforms that support liblzma -
the API uses uint64_t in quite a few places, via the lzma_vli typedef.
In any case, _lzmamodule.c checks for PY_LONG_LONG explicitly at
compile-time and gives a useful error message if it is undefined.