How to do versioning?

[mverleg]

There might not be a good way to support older versions...

Maybe at least have a way to make new additions optional?

And there should be a way to communicate the version including compatibility

[mverleg]

• Probably include the version in url, and keep hosting multiple versions
• Maybe do an attempt at making automatic migrations between versions, and user input requested if not automatically possible. I.e. v2.4 forwards to v2.5 after a transform. If entity A drops field b, that'd just get stripped while forwarding. Breaking changes require a major version bump.

[mverleg]

Should a missing property be the same as a property with null as value?