[issue12591] TextIOWrapper should fall back on read() if read1() doesn't exist

[Antoine Pitrou]

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

> "write_through" is not used in _pyio.py, is it expected?

Yup, because it is actually always write-through (writes are not
cached). The argument is only there so that the signature is the same as
the C version.

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<http://bugs.python.org/issue12591>
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