Documentation for workflow.Now is a bit vague

[uberbo]

Describe the bug
The documentation for workflow.Now seems to indicate that it returns a the current time when being replayed:

Now returns the current time when the decision is started or replayed.

But most people seem to assume that the returned time during a replay will be the same as the time returned during the first execution. It also seems that if it returns a the current time at replay it would lead to non-deterministic behavior, for example:

	cutoff := time.Unix(1610102641, 0)
	now := workflow.Now(ctx)
	if now.Before(cutoff) {
		// do something 
	} else {
		// do something else
	}

Can you clarify if workflow.Now actually "returns the current time when the decision is [...] replayed"?