__metadata should register function that returns type instead of literal type

Imagine case with circular dependencies

class Car {
  @Field owner: Person // !!! Error: Person is not defined.
}

class Person {
  @Field car: Car;
}

// car has owner, owner has car

Typescript metadata would be emitted here like

eg.
__metadata('design:type', Person).

As Person is injected for the first time before Person class is initialized, it will result with ReferenceError saying Person is not defined.

If it'd emit metadata like:
__metadata('design:type', () => Person)

it'd be fine.

Later on, when using Reflect.metadata, it would also need to call meta function instead of just returning the type.

If you think it's good idea, do you have any suggestions about starting point for PR that would implement this change?

まず、デコレータメタデータを出力する TypeScript コンパイラの経路を追跡し、次に Reflect.metadata が出力された値をどのように消費するかを調べます。完了条件は、循環する Car/Person の例で初期化時の ReferenceError が回避され、メタデータのコンシューマーが遅延された型関数を呼び出すことです。payload ではファイルやテストを指定しません。