Anuglar input[type=number] issue with exponential notation

<!DOCTYPE html>
<html>

  <head>
    <script data-require="angular.js@1.4.0" data-semver="1.4.0" src="https://code.angularjs.org/1.4.0/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-app>
    <form name="testForm">
      <input type="number" ng-model="num" />  
    </form>
      
    Form valid: {{testForm.$valid}} 
    
  </body>

</html>

// Code goes here

/* Styles go here */