copying: fold in graph copying (shared nodes, cycles, identity-map fix), serialization rules (constructors, record canonical constructor, ObjectInputFilter), record array components, clone() as a defensive copy, two more compile-error exhibits; 24 tests
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4BL3cEPHQTk2McE7C
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== 1. Diamond: root.left and root.right are the same node ==
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original : left == right : true
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copy constructor : left == right : false
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identity-map copy : left == right : true
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serialization copy : left == right : true
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== 2. Cycle: a -> b -> a ==
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original : a.left.left == a : true
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copy constructor : StackOverflowError
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identity-map copy : copy.left.left == copy : true
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identity-map copy : copy != original : true
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