Well, with the CREATE CONSTRAINT TRIGGER you _can_, but we already have a consensus that we don't _want_ that. Probably we should declare it deprecated and remove it in 7.5. And the option currently under discussion is exactly what will cause ALTER TABLE to let you, but IMHO that _should_ be restricted.
How can we ever remove it - what about people upgrading from 7.0, 7.1, 7.2? Also, people upgrading from 7.3 who've never heard of adddepend...
Chris
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