code: public WrappedByteBuffer putIntAt(int index, int v) {
          _checkForWriteAt(index, 4);
          _buf.putInt(index, v);
          return this;
      }
docs: Puts a four-byte int into the buffer at the specified index.
  
  @param index the index
  @param v the four-byte int
  
  @return the buffer