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Add helper functions that output arrays in a standard format, and use the functions inside heapdesc routines. This allows tools like pg_walinspect to show a detailed description of the page offset number arrays for records like PRUNE and VACUUM (unless there was an FPI). Also document the conventions that desc routines should follow. Only the heapdesc routines follow the conventions for now, so they're just guidelines for the time being. Based on a suggestion from Andres Freund. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-By: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/flat/20230109215842.fktuhesvayno6o4g%40awork3.anarazel.de