code: func DefaultSpec() *ConnectionSpec {
  	return &ConnectionSpec{
  		DefaultRedisHost,
  		DefaultRedisPort,
  		DefaultRedisPassword,
  		DefaultRedisDB,
  		DefaultTCPReadBuffSize,
  		DefaultTCPWriteBuffSize,
  		DefaultTCPReadTimeoutNSecs,
  		DefaultTCPWriteTimeoutNSecs,
  		DefaultTCPKeepalive,
  		DefaultTCPLinger,
  		DefaultReqChanSize,
  		DefaultRespChanSize,
  		DefaultHeartbeatSecs,
  		DefaultProtocol,
  	}
  }
docs: // Creates a ConnectionSpec using default settings.
  // using the DefaultXXX consts of redis package.