On 2018-12-05 13:41:32 -0500, Tom Lane wrote:
> The bigger picture here is that people seem to like to use domains
> as simple type aliases, which will never have any constraints, but
> we're very dumb about that today. So the patch as presented seems
> like it has lots of potential applicability, as long as we fix the
> invalidation aspect.
Entirely agreed.
