copying: deep vs shallow copy module (clone() traps, copy constructors, serialization copy, records, defensive copies, collection copies), 17 contract tests

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4X2xx7RrveVQU9R1N

copying/output/05-serialization.txt

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+== 1. A full deep copy: nothing is shared ==
+  copy.dept == asha.dept     : false
+  copy.skills == asha.skills : false
+  asha.skills = [java, spring], asha.dept = Core
+  copy.skills = [java], copy.dept = Platform
+
+== 2. transient fields are lost ==
+  asha.sessionToken = secret-token
+  copy.sessionToken = null
+
+== 3. Sharing INSIDE the graph is preserved ==
+  original: same Dept object  : true
+  copy    : same Dept object  : true
+  copy dept is a new object   : true
+
+== 4. Cycles are handled ==
+  cyc.mentor.mentor == cyc : true
+  cyc != asha              : true
+
+== 5. A non-serializable field fails at run time ==
+  NotSerializableException: java.lang.Object