Ths does remove the specialization of version's description. The way
this is done (internally through `mut_arg`) doesn't play well with
subcommands. Clap tries to force this version of `version` into the
subcommand despite not being needed. Clap v4 dramatically changes how
version customization works.
clap also does more error checks now to prevent programmer mistake, so
we can't have a conflict with an argument that is conditionally there,
so I swapped the condition.
Ed Page