"Down value"

Customer request:

> We’ve been using (also) sequelize with crdb and we’ve noticed that although CDRB supports ALTER TYPE type DROP value it isn’t exposed in your sequelize-cockroachdb package and PostgreSQL doesn’t support it yet (so it is missing from the sequelize pg dialect). All this results in funky and slow migration scripts (drop type, alter column, create type, alter column). Is there any chance you’ll add the support for “down value” in your package, or even better, create a proper crdb dialect in sequelize?