As an alternative, what would be the possibility of creating a new PL as a contrib module, say PLPGSQL_NG, to move forward with extensions like this and perhaps EVALUATE?
I think the idea of rewriting PL/PgSQL from scratch has merit (and it's something that I think would be well worth doing). IMHO it's not really worth the trouble to fork the existing code base and add new features to something that, hopefully, has a limited life span.
-Neil
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