[issue40060] socket.TCP_NOTSENT_LOWAT is missing in official macOS builds

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

It seems that people usually use the socket module like this, I think it's safe to respect this habit:

    if hasattr(socket, "FLAG_NAME"):
        do_something

If use PR19402, your program will have problem on the older version system, not only "don't break existing code".

So I think delete-at-runtime is a suitable way.

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<https://bugs.python.org/issue40060>
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