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The minor versions are interchangeable. An increase to the second number is a new (binary incompatible) major version occurring every 1-3 years.

It's unusual but not unique, see Python, Linux kernel, Postgres.

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It's not unusual either, afaik rapidly increasing x in x.y.z was very unfashionable before initial Chrome release. Many java projects (e.g. older Apache Foundation projects: Apache POI, etc) still follow that versioning scheme, it kinda looks like semver, but there is no commitment to preserving compatibility on y changes.

> The minor versions are interchangeable.

They are not, at least in Scala. See 2.12.x.

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