Property wrapper that keeps versioning of the property - Very useful for debugging

Versioned.swift

@propertyWrapper
struct Versioned<Value> {
  private var currentValue: Value
  private(set) var history: [Value] = []
  
  init(wrappedValue: Value) {
    self.currentValue = wrappedValue
  }
  
  var wrappedValue: Value {
    get {
      return self.currentValue
    }
    
    set {
      history.append(newValue)
      currentValue = newValue
    }
    
    var projectedValue: Self {
      return self
    }
  }
}