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52f0fc703f
should use GinItemPointerGetBlockNumber/GinItemPointerGetOffsetNumber, not ItemPointerGetBlockNumber/ItemPointerGetOffsetNumber, because the latter will Assert() on ip_posid == 0, ie a "Min" pointer. (Thus, ItemPointerIsMin has never worked at all, but it seems unused at present.) I'm not certain that the case can occur in normal functioning, but it's blowing up on me while investigating Tatsuo-san's data corruption problem. In any case it seems like a problem waiting to bite someone. Back-patch just in case this really is a problem for somebody in the field.