If possible, I would like to see the C library phased out of Python on
Windows, for file I/O. In this case, it would mean that ReadConsoleW is
used directly for character input. Notice that _cgetws does not take a
file handle as a parameter, but implicitly uses _coninpfh.

As a consequence, PyOS_StdioReadline probably should change its
parameter from FILE* to "file handle", and consequently rename it to,
say, PyOS_Readline.