code: func (pb *paramsBuffer) Start(s string) {
  	pb.lk.Lock()
  	pb.out.Reset()
  	pb.buf.Reset()
  	pb.buf.WriteString(s)
  }
docs: // Start initializes the params buffer with the initial string data.
  // It also locks the paramsBuffer.  The caller must call End() when
  // finished.