type muxConnectError struct {
	Error string
}

func (muxConnectError) Op() Op {
	return OpMuxConnectError
}

type pongMsg struct {
	NotFound bool      `msg:"nf"`
	Err      *string   `msg:"e,allownil"`
	T        time.Time `msg:"t"`
}

func (pongMsg) Op() Op {
	return OpPong
}

type pingMsg struct {
	T time.Time `msg:"t"`
}

func (pingMsg) Op() Op {
	return OpPing