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Reading through the documentation (which is good), there is one thing that seems pointless: --required-args and --required-values are actually the same thing, since it is said that default value of "yes" is assigned to all arguments that do not require an explicit argument.

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Indeed. This will probably be removed. The argument against --required-args is actually much simpler: it only makes sense to have groups of required arguments - such as when we either want -a -b -c or '-x -y -z', but it's pointless to demand to include any single argument that doesn't require an explicit value.

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