There are four functions istrue isfalse isnottrue isnotfalse
defined in bool.c and exported to SQL that are not documented anywhere and are not part of any spec that I would know of. The release notes indicate that they were used to implement IS TRUE, IS FALSE, etc. until PostgreSQL 6.2, so they were internal functions from the very beginning. Should we remove those now? I suppose there is a slight chance that 10 year old dumps might contain references to them? But it is easy to reimplement them in user-space should anyone need them.
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