Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Tim, do we care about whether "initial=None" versus "initial=_sentinel"?

The former makes for a nice looking pure python equivalent and works nicely 
with the argument clinic to generate a signature.  However, it precludes using 
None as the actual start argument (though I don't see why somewone would want 
to do that), and it isn't parallel to reduce() (not sure I care about that at 
all). 

Kristjan, do you want to contribute to the update of the pickle/copy code for 
this API extension?

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<https://bugs.python.org/issue34659>
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