[issue28647] python --help: -u is misdocumented as binary mode

[Eryk Sun]

Eryk Sun added the comment:

> It's not (currently) possible to have a fully unbuffered stdout.

Why doesn't create_stdio also pass `write_through = Py_True` when Py_UnbufferedStdioFlag is set? This would immediately pass writes through to the FileIO object, even without containing a newline (i.e. it sets text_needflush in _io_TextIOWrapper_write_impl).

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nosy: +eryksun

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<http://bugs.python.org/issue28647>
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