Let Clap Parse Arguments to the 'allow' CLI Option #619
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This PR fixes #614 by making Clap aware of what arguments can be passed to
--allow.A side-effect of this is that Clap now also handles the parsing of these arguments.
This actually makes our code cleaner, since we don't have to do this parsing ourselves anymore,
but means that if a user mis-types an argument, they'll get a Clap error, instead of one of our errors.
See #429.