In case of pagination both old and new variants are supported in 0.19 (see my reply to fmstrat above). TOTP is currently broken so it wouldnt make sense to keep supporting the old version. In case of auth it would be possible to keep backwards compat, but keep in mind that we are only two fulltime devs with tons of other things to work on. If we spend a lot of time on this, it means less time for other important tasks. Besides you can support both 0.19 auth and 0.20 auth at the same time by sending auth as param and header/cookie.