After copy.replace(record, status="sent"), what should you assume about an unchanged muta…

After copy.replace(record, status="sent"), what should you assume about an unchanged mutable field named tags?

1. It may still reference the same object and must be checked against the type’s replacement semantics.
2. It is always recursively copied.
3. It is converted to an immutable tuple.
4. The operation is invalid whenever a record has a mutable field.