R. David Murray added the comment:

To summarize, it looks like there are three issues here: (1) the python and C 
versions are out of sync behavior wise (the python should work like the C in 
this case, it seems) (2) there are some missing tests, since we are running the 
same tests against both code bases and not getting any errors and (3) replace 
is doing its copy in a way that does not actually supporting subclassing (which 
again speaks to missing tests).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20371>
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