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The changes I made in 578b229718e assigned oids below FirstBootstrapObjectId to objects in include/catalog/*.dat files that did not have an oid assigned, starting at the max oid explicitly assigned. Tom criticized that for mainly two reasons: 1) It's not clear which values are manually and which explicitly assigned. 2) The space below FirstBootstrapObjectId gets pretty crowded, and some PostgreSQL forks have used oids >= 9000 for their own objects, to avoid conflicting. Thus create a new range for objects not assigned explicit oids, but assigned by genbki.pl. For now 1-9999 is for explicitly assigned oids, FirstGenbkiObjectId (10000) to FirstBootstrapObjectId (1200) -1 is for genbki.pl assigned oids, and < FirstNormalObjectId (16384) is for oids assigned during bootstrap. It's possible that we'll have to adjust these boundaries, but there's some headroom for now. Add a note suggesting that oids in forks should be assigned in the 9000-9999 range. Catversion bump for obvious reasons. Per complaint from Tom Lane. Author: Andres Freund Discussion: https://postgr.es/m/16845.1544393682@sss.pgh.pa.us