I still don't see anything particularly wrong with your patch. It
applies, passes all test, it is well test-covered and even documented.
Also I've run `make installcheck` under Valgrind and didn't find any
Thank you very much as usual!
Is there anything that you would like to change before we call it more
or less final?
I would like to add some primitive nodes for precalculation if their
behaviour allows to do it and their arguments/inputs are constant or
precalculated too; and regression tests for it, of course. Also I would
like to add some notes about precalculation of stable functions in
documentation, for example, here  and here .
Also I would advice to add your branch to our internal buildfarm just
make sure everything is OK on exotic platforms like Windows ;)
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