[issue38531] argparse action "extend" not documented as new

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

I've added it to my todo list for the next round of updates.  Though I also plan to do some parsing of the more minor feature adds to make the document more readable.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<https://bugs.python.org/issue38531>
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