Issue with GRANT/COMMENT ON FUNCTION with default

Prior to default parameters on functions, GRANT and COMMENT accepted full parameter syntax. IE:

GRANT EXECUTE ON test(t text) TO public

as opposed to regprocedure, which only accepts the data types ( test(text), not test(t text) ).

They do not accept DEFAULT though:

GRANT EXECUTE ON FUNCTION test(t text DEFAULT '') to public;
ERROR: syntax error at or near "DEFAULT"
LINE 1: GRANT EXECUTE ON FUNCTION test(t text DEFAULT '') to public;

Presumably this is just an oversight? Related to that, is it intentional that the regprocedure cast disallows *any* decorators to the function, other than type? If regprocedure at least accepted the full function parameter definition you could use it to get a definitive reference to a function.
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Jim C. Nasby, Data Architect jim(at)nasby(dot)net
512.569.9461 (cell) http://jim.nasby.net