Have optional subcommands take priority over positional arguments #299
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As illustrated in the test case, if there's an optional subcommand but the parent command also takes positional arguments, the subcommand is never selected. This PR alters the order of checks so it is preferred over filling in a positional argument.
I suppose this probably represents a slightly suboptimal flag design in the first place since it implies some ambiguity, but we found ourselves there nonetheless :(