Why recursion does not occur, when I assign a value to a property within its own didSet observe?

Question

Here is the code:

class StepCounter {
var totalSteps: Int = 0 {
willSet(newSteps) {
print("About to set totalSteps to \(newSteps)")
}
didSet {
totalSteps+=10// I thought recursion should occur (willSet and didSet should be called every time)
print ("\(totalSteps - oldValue) steps")
}
}
}
let stepCounter = StepCounter()
stepCounter.totalSteps = 50

Answer 1

I guess that's how Swift was designed. The official Apple documentation says: "If you assign a value to a property within its own didSet observer, the new value that you assign replaces the one that was just set."