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test(derive): No longer supporting some wrapped types
With the new `ArgMatches`, we need to know what the inner type is. Unfortunately, #3142 didn't list use cases for this. We dropped the `Option` alias changing `T` but we still have a `Result` in there that is aliased. One potential workaround if people need it is if we add an attribute to specify the `get_many::<T>` type. This would also help with `ArgAction::Count` to support more data types.
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