Martin Panter added the comment:

I noticed another possible problem with using TextIOWrapper. We call tell() to 
see if a rollover is needed. But I think TextIOWrapper streams can return 
complicated values from tell(), encoding stuff like codec state and buffered 
data in an integer. At the minimum, I think the meaning of max_size has changed 
(code points vs bytes). And perhaps it won’t work very well with some codecs 
that record state in the tell() value.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26730>
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