New submission from Serhiy Storchaka <storchaka+cpyt...@gmail.com>:

It is documented that io.IncrementalNewlineDecoder inherits 
codecs.IncrementalDecoder. And the Python implementation does. But the C 
implementation doesn't.

>>> issubclass(_pyio.IncrementalNewlineDecoder, codecs.IncrementalDecoder)
True
>>> issubclass(_io.IncrementalNewlineDecoder, codecs.IncrementalDecoder)
False
>>> issubclass(io.IncrementalNewlineDecoder, codecs.IncrementalDecoder)
False

----------
components: IO, Library (Lib)
messages: 303879
nosy: benjamin.peterson, serhiy.storchaka, stutzbach
priority: normal
severity: normal
status: open
title: _io.IncrementalNewlineDecoder doesn't inherit codecs.IncrementalDecoder
type: behavior
versions: Python 2.7, Python 3.6, Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31722>
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