The cmp
operator works on code numbers, or at least that's what I think it does because the docs aren't explicit on that and don't mention any localization stuff.
Can I make it sort by other collations? I know I tell sort how to compare, but I figure it must be in there already (somewhere).
Collation is available as an experimental feature:
Please give feedback on this feature to help it move out of the "experimental" state and be included in v6.d.