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This restriction is implicit in the check-only-once implementation we use
for table and domain constraints, but it wasn't spelled out anywhere, nor
was there any advice about how to alter a constraint's behavior safely.
Improve that.
I was also dissatisfied with the documentation of ALTER DOMAIN VALIDATE
CONSTRAINT, which entirely failed to explain the use of that feature; and
thence decided that ALTER TABLE VALIDATE CONSTRAINT could be documented
better as well.
Perhaps we should back-patch this, along with the related commit
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