testing questions

• Why method defined like "cons[B >: A](v: B)" accepts argument of type which is not supertype of A?
• Vagrant not installing pip during provision
• Why angular `ng-repeat` have different checkbox differentiate behavior then listing out checkbox manually?
• Race condition with ng-class and animation
• Lazy loading occasionally doesn't work in angular
• What is ViewChild in Angular2?
• How to get data from observable in angular2

testing answers