But records don't actually offer such guarantees: record MutableRecord(ArrayList<String> list) {} var r = new MutableRecord(new ArrayList<>());

But records don't actually offer such guarantees: record MutableRecord(ArrayList<String> list) {} var r = new MutableRecord(new ArrayList<>()); System.out.println(r.hashCode()); // -> 1 r.list().add("foo"); System.out.println(r.hashCode()); // -> 101605 I sort of hoped they would freeze hashcode but they don't.