Tom Lane wrote:
In fact you could argue that our current behavior is *more* useful than
what the spec says for polymorphics.  You would not want the special
case for NULLs, in most cases, I'd think.  NULLs have perfectly well
defined datatype.

That's actually exactly what I was thinking.

However, it troubles me to be using a spec-defined syntax for a behavior
that is not standard.  I'd prefer to change the syntax if we are going
to keep the behavior.  That probably puts it in the "too late for 7.4"
category.  So I'm inclined to follow the path of leaving it undocumented
for now, implementing a new syntax in 7.5, and documenting it under that
syntax then.

Sounds good to me.



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