STINNER Victor added the comment:

> FYI Raymond, your revision 0731f097157b didn’t actually merge the 3.5 branch 
> (It only had one parent). Also, the default branch never got any NEWS entry 
> in 58266f5101cc, so maybe it needs to be added?

Maybe it's also worth to document the change in Python 3.5 and 3.6 
documentation with a ".. versionchanged::"?
https://docs.python.org/dev/library/collections.html#deque-objects

It can be suprising to get a different behaviour between two bugfix versions 
(Python 3.5.1 and 3.5.2). I'm not saying that we must not fix bugs, just that 
it helps users to document them :-)

It will also avoid bug reports about this behaviour change. Example of user 
report: issue #26260, "it works on Python 2 but no more on Python 3" ;-)

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