Well crap, I searched for range stuff on PGXN before creating http://pgxn.org/dist/range_tools/ and the only thing that came up was your range_partitioning stuff, which AFAICT is unrelated. http://pgxn.org/dist/range_type_functions/ still doesn't show up in search, maybe because it's marked unstable?
Rather frustrating that I've spent time creating an extension that duplicates your work. :(
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