I noticed in the bug tracker that 4.2 is "unsupported", but what else are we supposed to use? The v4.3 tag is even older. I tried tvheadend-git from AUR, which was at version 4.3-2433gf1c460feb at the time, creating a new configuration from scratch, and I couldn't get authentication to work consistently (403 errors despite all permissions being enabled in the user I had created).
Then I stumbled across this WIP changelog. It appears to have an alternative version numbering scheme in which the minor version decreases instead of increasing. How does that work? The newest "release" there, 12.34.1, links to debs and rpms with version 4.3-2351 which are about a year old. Are they more reliable than git head?