code: public Frame<V> init(final Frame<? extends V> src) {
          returnValue = src.returnValue;
          System.arraycopy(src.values, 0, values, 0, values.length);
          top = src.top;
          return this;
      }
docs: Copies the state of the given frame into this frame.
  
  @param src
  a frame.
  @return this frame.