Commits on May 4, 2022

1. fix(v4): Disallow leading dashes in long's …

   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.

   

   epage committed May 4, 2022
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