Just out of curiosity, from people who have gone through the process of plugin submission & updating, what is the rule for updating version numbers?

I ran across a repository plugin dev who kept updating his plugin but not updating the version number so I had no idea for months that his plugin was coming out with incremental improvements.

When I called him on it in the support forums, he said that the changes he was making were minor, and he had no reason to increment the version number until he'd made enough minor changes to warrant an actual version change.

I stopped using his plugin and went looking for a different way to get the functionality I was testing out.