docs: public void cast(Local<?> target, Local<?> source) {
          if (source.getType().ropType.isReference()) {
              addInstruction(new ThrowingCstInsn(Rops.CHECK_CAST, sourcePosition,
                      RegisterSpecList.make(source.spec()), catches, target.type.constant));
              moveResult(target, true);
          } else {
              addInstruction(new PlainInsn(getCastRop(source.type.ropType, target.type.ropType),
                      sourcePosition, target.spec(), source.spec()));
          }
      }