code: function(getterSetter, context, eventName) {
  		this._set = context ? getterSetter.bind(context) : getterSetter;
  		this._get = context ? getterSetter.bind(context) : getterSetter;
  		this._canObserve = eventName === false ? false : true;
  		// The helper provides the on and off methods that use `getValueAndBind`.
  		var handlers = setupComputeHandlers(this, getterSetter, context || this);
  
  		assign(this, handlers);
  	}
docs: ## Setup getter / setter functional computes Uses the function as both a getter and setter.