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It turns out that newPrefix always ends up being the same as flagName; in the case where there's an existing prefix, flagName was already set to "prefix + flagName". Which means that, if something is double-nested, the name got appended twice. Also add a corresponding test case.
This is a bit clunky and possibly just plain a bad idea, but I got really curious about whether it could be done. Answer: Yes. The difficulty in supporting maps is (1) making sure we can find names for them, (2) handling assignments to them, since their contents aren't addressable. So we require that keys either be string or satisfy Stringer, and we build a table of known map-member arguments, and build a followup pass to come back and assign those back over. This only works with Run/RunArgs. The Flags function isn't changed, and won't support the new feature, but FlagsMap could in theory -- it returns a cleanup function to call to do the map assignments. This is probably a bad idea.
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This is probably sorta insane, I just wanted to see if it could be done.
Map members only define arguments for entries they have when the provided structure-or-map was scanned to create arguments.