[docs] [issue16802] fileno argument to socket.socket() undocumented

[Richard Oudkerk]

Richard Oudkerk added the comment:

> The "fileno" argument looks like an implementation detail to me.

It has at least one potential use.  On Windows socket.detach() returns a socket handle but there is no documented way to close it -- os.close() will not work.  The only way to close it that I can see (without resorting to ctypes) is with something like

    socket.socket(fileno=handle).close()

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