deserialize_with_metadata

# File activesupport/lib/active_support/messages/metadata.rb, line 43
        def deserialize_with_metadata(message, **expected_metadata)
          if dual_serialized_metadata_envelope_json?(message)
            envelope = deserialize_from_json(message)
            extracted = extract_from_metadata_envelope(envelope, **expected_metadata)
            deserialize_from_json_safe_string(extracted["message"])
          else
            deserialized = deserialize(message)
            if metadata_envelope?(deserialized)
              extract_from_metadata_envelope(deserialized, **expected_metadata)["data"]
            elsif expected_metadata.none? { |k, v| v }
              deserialized
            else
              throw :invalid_message_content, "missing metadata"
            end
          end
        end