Hstore is definitely an odd one in that it's an extension so sort of core, sort of not. Other's its likely just that people default to what the ORM does. Hstore

Hstore is definitely an odd one in that it's an extension so sort of core, sort of not. Other's its likely just that people default to what the ORM does. Hstore actually sees 13% usage across production databases on Heroku, so while something I'd still consider it much lower than what it probably should be.