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Back-patch key parts of4c5cf5431
and6ca547cf7
into stable branches. I didn't touch pg_description entries here, so it's purely a docs change; and I didn't fool with any examples either. The main point is so that anyone who's wondering if factorial() exists in the stable branches will be reassured. Mark Dilger and John Naylor, with some adjustments by me Discussion: https://postgr.es/m/BE2DF53D-251A-4E26-972F-930E523580E9@enterprisedb.com