New submission from Nick Coghlan:

In discussing #15216, I noticed that the write_through parameter is completely 
unused in the Python implementation of TextIOWrapper.

That also means we have a hole in the test coverage: there is no test that is 
run on both the C and Python versions to ensure that the data is being written 
directly through to the underlying buffer (e.g. by passing in a mock buffer 
object).

----------
components: Library (Lib)
messages: 167603
nosy: ncoghlan
priority: release blocker
severity: normal
stage: test needed
status: open
title: Python version of TextIOWrapper ignores "write_through" arg
type: behavior
versions: Python 3.3

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15571>
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