Use of `Type`.

[lrhn]

I notice that the only use of Type is reflectedType.

Maybe consider not having it at all. The only use for a Type object is to == compare it with another, so maybe replace reflectedType with isReflectedType<R>() which returns whether the reflected type is R.

Then users will have one less reason to ever care about Type objects, and we'll have one less reason to keep supporting it. The Type class should really have been placed in dart:mirrors, and it's a bad design to have runtimeType on Object. So, consider not using it at all.

[jakemac53]

You may also want to cache certain things by Type to avoid duplicate work. We could possibly cache instead by the TypeMirror instances though?

As long as all the use cases are still workable I would be ok with removing this.