Is there way to avoid/workaround Angularjs computed property running twice everytime?

http://jsfiddle.net/V9sYB/50/

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.min.js"></script>
<div ng-app>
  <div ng-controller="SomeCtrl">
      <input ng-model="textProperty"/>      
      <span>{{computedProperty()}}</span> 
  </div>
</div>

script

function SomeCtrl($scope) {
  $scope.textProperty = "initial";
    var times = 0;
    $scope.computedProperty = function(){
        console.log(++times);
        return $scope.textProperty+ " asdf";
    };
}

Is there way to avoid/workaround Angularjs computed property running twice everytime?

or Do I have to write directive for the one that I will never reuse on another controller?