> it doesn't really matter if it never makes it to the spec I does matter as there is difference between introducing type support in a language and introducing

> it doesn't really matter if it never makes it to the spec I does matter as there is difference between introducing type support in a language and introducing features that completely are non standard. Now imagine TC39 introduces a decorator syntax that is not compatible with Typescript's implementation ( it happened in the past with previous Typescript module syntax and the language had to break compatibility ) Angular 2 is completely based on the use of decorators to inject almost anything. Sometimes the decorator definition itself is bigger than the class using it.