[issue9351] argparse set_defaults on subcommands should override top level set_defaults

[paul j3]

paul j3 <ajipanca at gmail.com> added the comment:

A new patch, https://bugs.python.org/issue45235 has clobbered this patch.

It has also exposed the inadequate unittesting for the case(s) where the 'dest' of main namespace, subparser namespace, user provided namespace overlap.

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<https://bugs.python.org/issue9351>
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