code: func (fc *FuzzedConnection) fuzz() bool {
  	if !fc.shouldFuzz() {
  		return false
  	}
  
  	switch fc.config.Mode {
  	case FuzzModeDrop:
  		// randomly drop the r/w, drop the conn, or sleep
  		r := rand.Float64()
  		if r <= fc.config.ProbDropRW {
  			return true
  		} else if r < fc.config.ProbDropRW+fc.config.ProbDropConn {
  			// XXX: can't this fail because machine precision?
  			// XXX: do we need an error?
  			fc.Close()
  			return true
  		} else if r < fc.config.ProbDropRW+fc.config.ProbDropConn+fc.config.ProbSleep {
  			time.Sleep(fc.randomDuration())
  		}
  	case FuzzModeDelay:
  		// sleep a bit
  		time.Sleep(fc.randomDuration())
  	}
  	return false
  }
docs: // implements the fuzz (delay, kill conn)
  // and returns whether or not the read/write should be ignored