Question: Does `status` need to be mutex protected?

[masrur-mahmood-cdx]

Hello,

I'm very impressed with the work you did on this library. Very neat indeed. I had a question for you... in your implementation of the Promise struct, is there a reason why status doesn't need to be mutex protected?

type Promise struct {
	// Fn represent the underlaying promised function
	fn func(*Promise, ...interface{})

	// Args represents the arguments that needs to be passed when the promise is invoked
	args []interface{}

	// Not Started: 0
	// Pending: 1
	// Finished: 2
	status byte                    // <---- does this status variable need to be protected by a mutex or rwmutex?
	wg     sync.WaitGroup

	then ThenHandler
	// Result
	result interface{}

	// Error
	err error

	batch bool
}