Changes to directive value do not trigger changes

[DaSchTour]

As I understood from the documentation it should be possible to change the input value of a directive. But in fact changing the value doesn't do anything.
See my example here: https://plnkr.co/edit/eHkmFJmmskANN7JUoMmT

[aciccarello]

That example does not work because the input name is the same as the directive name. Does anyone know if that is supposed to be supported?

Here is an example of ngOnChanges working for a directive: https://plnkr.co/edit/xJQb71v6XeqvzZoc6yJo?p=preview