Why are there 4 numbers in the versioning scheme?
It seems the first number is always `0`, which suggests that Monero is in some kind of pre-release state.  I doubt this is the case.  Shouldn't the leading `0` be dropped?  If not, does that mean the second and third numbers are minor and patch numbers, and the fourth a build number? 

Perhaps the idea was to follow some kind of similarity with the [Bitcoin version history](https://bitcoin.org/en/version-history)? 🤔