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It uses sealed classes, JDK21 SequencedSet and SequencedMap implementation, Math.clamp(), and get benifit from modern JIT optimization.

That not much to jump all the way to jdk21.

Math.clamp is literally 2 / 3 lines.

The Tree Supports JEP431(Sequenced Collection) and my whole node structure is based on pattern match and sealed classes.