code: public java.lang.String getMaybeTypeName() {
      java.lang.Object ref = maybeTypeName_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        maybeTypeName_ = s;
        return s;
      }
    }
docs: <pre>
  For debug-only, the name of the type pointed to by this handle, if
  available.
  </pre>
  
  <code>optional string maybe_type_name = 5;</code>