> Obviously, the implicit casts are not for PostgreSQL and would be
> rightly rejected here, but I am not sure that the ability to prefer
> one function or operator over others in an overloading situation is
> such a bad idea. So far, our internal testing seems to show that it
> works well and doesn't break things.
Hmmm. Is this better to do on the cast level or the function level?
For the case discussed, it would be sufficient to have a way to mark a
particular function signature as "preferred" in cases of ambiguity, and
that would be a lot less likely to have side effects. Mind you, fixing
the cast in general would fix far more annoying cases, but I also see it
as something which would be very hard to get correct ...
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