[issue8765] Tests unwillingly writing unicocde to raw streams

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The 3.1 version does it correctly since issue7785, but this was not backported to 2.x.
Python 3.x uses the "y*" format code to accept bytes and not unicode; this code does not exist in 2.x, and was replaced with "s*", which accepts unicode.
But since the io module is designed up front to forbid default conversion between bytes and unicode, I think it's safe to change the code as suggested.

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