Bind value with boolean type are casted from undefined to false

[albertkur]

Use case: when we have a boolean property to bind in a component. The expectation is that if we don't bind the value the getBound() method in the view model should return undefined. but vue casts boolean values from undefined to false.

vuejs/vue#4792

Vue does this to support HTML attributes. for example if we don't set the disabled attribute in an input element that means disabled = false. this behavior is documented in vue 3 https://vuejs.org/guide/components/props.html#boolean-casting

but in the case of n-app we create our own components. so the expectation is that when we don't provide a value for boolean attributes getBound() should return undefined