code: public WrappedByteBuffer putBufferAt(int index, WrappedByteBuffer v) {
          // TODO: I believe this method incorrectly moves the position!
          // Can't change it without a code analysis - and this is a public API!
          int pos = _buf.position();
          _buf.position(index);
          _buf.put(v._buf);
          _buf.position(pos);
          return this;
      }
docs: Puts a buffer into the buffer at the specified index.
  
  @param index the index
  @param v the WrappedByteBuffer
  
  @return the buffer