Documentation
Instead of saying "any container" is supported, refer only to "sequences".
Technically, a Container is only required to support __contains__ which is insufficent for argparse. Also, a sets do get accepted are a bad choice because the order shown in help and usage is non-deterministic. So, Sequence is the only reasonable choice because we need sizing and ordered iteration.
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Documentation
Instead of saying "any container" is supported, refer only to "sequences".
Technically, a Container is only required to support __contains__ which is insufficent for argparse. Also, a sets do get accepted are a bad choice because the order shown in help and usage is non-deterministic. So, Sequence is the only reasonable choice because we need sizing and ordered iteration.
Linked PRs