[nwatson]

This works well only if you're supporting a linear evolution of releases, no branching or LTS or back-porting.

[goerz]

There’s nothing that says you can’t have patches in calver, as e.g. `YY.MM.patch`. So you can definitely have an LTS calver release, or even back port new features. You just have to do it in the patch version, or adopt some other variation of the scheme, e.g.`YYYY.minor.patch` or `YY.MM.minor.patch`

[MiddleEndian]

Yep. This is what Ubuntu does, roughly. Version 2020.04 is LTS and will get security updates until 2030 April (04)