checkbox directive using angularjs

I am trying to create a checkbox directive with angularjs.The code is here in JSFIDDLE

It works fine only with ng-model and text.

But if i add ng-true-value and ng-false value, it throw error as

nged2angular.js:12520 Error: [ngModel:constexpr] Expected constant expression for `ngTrueValue`, but saw `bindedTrueValue`.

Also i need to take the ng-change controller function inside the directive.