Eric Snow <ericsnowcurren...@gmail.com> added the comment:

FWIW, subclassing builtin types is a relatively new thing.  There are still a 
number of lingering (older) implementation details throughout CPython that were 
written assuming no subclassing.  I'd guess that this is one of them.

----------
nosy: +eric.snow
stage:  -> test needed
type:  -> behavior

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35983>
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