Provide an alias for the negated boolean option

[aks]

If a boolean option is to receive an automatically generated negative option, eg:
option :unicode also causes an option of --no-unicode to be allowed, then there should be a way to specify an alias to the negative switch. Perhaps allow :negative_aliases option?

For example:

 option :unicode, aliases: '-U', negative_aliases: '-A', type: :boolean, default: false, desc: "Use Unicode for displays; if negated use ASCII"

or perhaps

 option :unicode, aliases: ['-U', '-A'], type: :boolean, default: false, desc: "Use Unicode for displays; if negated, use ASCII"

where the 2nd alias in the array argument to aliases is mapped to the negative switch?

[doudou]

Yep ... I currently work around it by providing definining a hidden option that has the alias, but that would definitely be better ;-)