public final class ClassKey extends Object implements Comparable<ClassKey>
Class.
The reason for having a separate key class instead of
directly using Class as key is mostly
to allow for redefining hashCode method --
for some strange reason, Class does not
redefine Object.hashCode() and thus uses identity
hash, which is pretty slow. This makes key access using
Class unnecessarily slow.
Note: since class is not strictly immutable, caller must know what it is doing, if changing field values.
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