I'm now convincing myself to the third option:
> Extend the syntax but preserve backward compatibility via default:
>
> COMMENT ON [{PROCEDURE | FUNCTION}] PARAMETER ...
but if the object type specifier is omitted, then the engine tries to be
smart and determine whether it's a procedure or a function at runtime
(by searching in both tables). In the case both exist with the same
names, an ambiguity error is thrown.
Dmitry
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