sys.stderr.write returns string length in Python 3

[Alan G Isaac]

Is this new behavior intentional? ::

        >>> sys.stderr.write("thisisatest\n")
        thisisatest
        12

Here is the reason for it:

        >>> help(sys.stderr.write)
        Help on method write in module io:
        write(self, s: str) method of io.TextIOWrapper instance

Thank you,
Alan Isaac
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