- Unrelated classes that just happen to have matching constructor types
(maybe sibling classes extening the same base class, and simply
calling super on all constructors) should not be reported as copy-paste
- If you copied a whole class, CPD should still match it due to other
member methods / fields, only case it would no longer catch is that of
a class exclusively containing constructors, but that should probably be
a PMD rule, and not catched by CPD itself
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