If there's no reason against it, I think it's worth its own
entity name. Embarrassingly enough, I was not aware that
8859-1 even *had* a hyphen character distinct from the
minus, and would gladly use the hyphen if I knew.
Perhaps it even makes sense to consider assuming that an
ASCII minus sign "-" represents a hyphen, and using an
entity reference for the minus. I haven't seen more than
perhaps a handful of HTML-2 documents that use the minus
sign as a minus. That seems likely to violate a lot of
precepts about SGML or text formatting in general, however,
so I won't push it.