Message 137904 - Python tracker

> Example with ANSI=cp932 (on Windows Seven):
>  - b'abc\xffdef'.decode('mbcs', 'replace') gives 'abc\uf8f3def'
>  - b'abc\xffdef'.decode('mbcs', 'ignore') gives 'abcdef'

Oh, and b'\xff'.decode('mbcs', 'surrogateescape') gives '\udcff' as expected. At least for surrogateescape, it would be nice that mbcs supports any error handler on encoding.