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I backported and adapted most Python 3 fixes related to the Windows binary mode for stdout/stderr used when Python is started with the -u command line option. See attached binary.patch.
My change to file.write() looks wrong because the function returns None and does not loop until all bytes are written.
By the way, string_write() doesn't check if fwrite(n) wrote less than n bytes or failed with an error.
See also the issue #21090 which improves error handling in the file object.