Widening permitted subclasses

[liach]

In Java 17, released a few days ago, sealed classes officially become a feature. It seems this library is a good place to support the functionality of adding more permitted subclasses to a sealed class (or destroy the seal altogether), since sealed class status is described together with being final, both as restrictions on inheritance.

Note: in practice, this may be less useful because the permitted subclasses must be in the same package (in an unnamed module) or in the same named module. Since Minecraft distributions run as unnamed modules, it may be interesting to see their usage of sealed classes once they update to Java 17 (little reason not to do so as 17 is a LTS release)

[ZekerZhayard]

Isn't #11 done?

[ghost]

That only allows you to remove the sealed modifier, not add additional classes to be permitted.

[liach]

but goig back to the note, adding additional permissions can only work for same package/module, so the feasibility is subject to discussion.