Add some @ember-decorators inspired decorators

[NullVoxPopuli]

to maybe eliminate the need for setState all together.

// something like:
function tracked(target, name, descriptor) {
  // logic
  return {
    ...descriptor,
    get() {
      descriptor.value;
    }
    set(val) {
      this.setState(name, val);
    }
  }
}

class Whatever extends React.Component {
    @tracked fromDate;
}

[NullVoxPopuli]

this is pretty legit: https://codesandbox.io/s/j24oo3z823

state updates asyncily by doing this.property = value

[NullVoxPopuli]

completly omitting the class property value and keeping everything in state: