Permit variadic functions and flag.Value-typed parameters #3
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This PR adds support for subcommand-implementing functions whose parameter lists end in
...stringas an alternative to[]string.It also adds support for flag.Value-typed parameters.
It also adds support for multiple leading hyphens in the
Param.Namefield; i.e., you can write"-verbose"or"--verbose"(or even"---verbose") and it will mean the same thing: a flag namedverbose, which at runtime will match a command-line option named-verboseor--verbose(per the behavior of Go's standard flag package).