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An ALTER FUNCTION command that tried to update both the function's proparallel property and its proconfig list failed to do the former, because it stored the new proparallel value into a tuple that was no longer the interesting one. Carelessness in 7aea8e4f2. (I did not bother with a regression test, because the only likely future breakage would be for someone to ignore the comment I added and add some other field update after the heap_modify_tuple step. A test using existing function properties could not catch that.) Per report from Bryn Llewellyn. Back-patch to all supported branches. Discussion: https://postgr.es/m/8AC9A37F-99BD-446F-A2F7-B89AD0022774@yugabyte.com