Earlier quoted context omitted.
Other correct comments about a quite active 'next' branch aside... The latest commit on master is Nov 12, 2015 . That's not even half a year ago . The stable shelf life of software worth mentioning is longer than that, don't you think?
Yes of course, but I would expect many commits between stable releases (patching issues). I guess this is just a different pattern where a solo-dev goes quitely working for a few months and then emerges with the next release.
Most of the "bugs" (or rather, limitations) in the issue tracker are either discussions or things that are difficult to address w/ the current codebase - e.g. design/ergonomics issues, as opposed to implementation issues - Those are part of the reason for the rewrite.
Another thing that is worth mentioning is that Mithril's general philosophy is to avoid adding features for features' sake, so it can look less "active" than it actually is.