The funny thing about Java is that while its design is to be entirely nominally typed, the way it is implemented in the JVM is compatible with structural typing, but there are artificial limitations set to follow the intended design (though of course, if one were to disable these limitations then modeled type safety goes out of the window as Java was simply not designed to be used that way). One community which takes advantage of this fact is the Minecraft modding space, as it is the basis[1] of how modding platforms like Fabric work.1: https://github.com/SpongePowered/Mixin/wiki/Introduction-to-...
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