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This change makes it possible to use literal question marks in queries to PostgreSQL. This is needed to be able to use the new JSON operators. https://www.postgresql.org/docs/9.5/static/functions-json.html
This change can't break anything, since:
Anyone using double question marks would get an error if not supplied the adequate amount of accompanying values (in case of people trying the new JSON operators); or
If supplied the adequate amount of accompanying values, PostgreSQL would throw a fit because you'd supply two values directly next to each other, which doesn't make sense.