> I also recall being "confused" by fact that "minor" version increments
> are the ones that break compatibility, not just the major ones... if
> you are using PG anyway :-)

It's all terminology.  PG defines "minor" as the version at the third
place.
So for PG a minor version upgrade is 8.4.1 to 8.4.2 and that will
never introduce new features nor will it break compatibility and will
never change the on-disk layout.

A "major" upgrade is either the first or second digit (8.3 -> 8.4, or
8.4 -> 9.0)

I think H2 could profit from something similar. Anyone who is using H2
in a production environment must have a way to use a bugfix release
that is guaranteed to not break anything (read: not change existing
functionality, not change on-disk layout, not change existing API)

How that is reflected in the numbering is a completely different
thing.

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