Glenn Linderman <v+pyt...@g.nevcal.com> added the comment:

So the missing signature is why I didn't understand, probably. At least, it 
seems reasonable to blame that :)  You didn't include [version] in the 
signature, but that isn't your fault: it isn't in the original and should be 
(see action "version").

So key is optional and defaults to dest... I saw that, but was already 
confused.  This latest example clears up why you might want to overrride dest 
for use in different arguments... very similar to why dest is allowed to be 
specified instead of its default value.

And dest could be used, it is sufficient, but allowing specification of key to 
override it is more flexible, and could save user code in some circumstances, 
with little cost to the implementation.

Sounds good to me now.

I was also surprised by introduction of a "capture" action by itself, and look 
forward to documentation for it, as things progress. I can guess about 
store_capture and append_capture from the definition of extend_capture.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43046>
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