fix(v4): Disallow leading dashes in long's #3691
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This is a step towards clap-rs#3309. We want to make longs and long aliases more consistent in how they handle leading dashes. There is more flexibility offered in not stripping and it matches the v3 short behavior of only taking the non-dash form. This starts the process by disallowing it completely so people will catch problems with it and remove their existing leading dashes. In a subsequent breaking release we can remove the debug assert and allow triple-leading dashes.
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This is a step towards #3309. We want to make longs and long aliases
more consistent in how they handle leading dashes. There is more
flexibility offered in not stripping and it matches the v3 short
behavior of only taking the non-dash form. This starts the process by
disallowing it completely so people will catch problems with it and
remove their existing leading dashes. In a subsequent breaking release
we can remove the debug assert and allow triple-leading dashes.