Brad King e6d1e29ffa cmArgumentParser: Model maybe-empty and non-empty lists with wrapper types ...

Previously bindings to `std::vector<std::string>` required at least one
value.  Some clients have been filtering `keywordsMissingValue` to
support keywords followed by empty lists.  Instead, require clients to
specify whether a keyword's list can be empty as part of the binding
type.

2022-07-07 09:48:58 -04:00

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