Not sure if you should rely on SemVer for maturity estimates either, though. I guess it can be one signal, but I wouldn't say a very useful one.
can't answer one and the other consistently.
it's great for compatibility level, and that's that.
- Number of commits.
- Number of open issues.
- Number of closed issues.
- How they respond to issues.
- Are the commit messages descriptive?
- Is the codebase a mess or does it look reasonable?