[issue8765] Tests unwillingly writing unicocde to raw streams

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Allright, what's the expected behaviour then - implicitly converting
> unicode to bytes (like C RawFileIO), or raising a typeerror (like
> buffered streams do) ?

Sorry, I should have been clearer. The expected behaviour is to raise a
TypeError. The new io module was written for Python 3, where you
shouldn't mix bytes and unicode strings and expect things to work.

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