Intellisense does not work with [P in keyof T]

TypeScript Version: 2.1.5

Code

//Operators available for the object fields
export type Operators<T> = {
    $elementMatch?: T | Operators<T>;
    $in?: T[];
}

//Filter declaration. 
export type Filter<T> = {
    //field, you can assign a value, or an operator.
    [P in keyof T]: Operators<T[P]> | T[P];
}

function query<T>(filter: Filter<T>) {  }

//Sample class
class Sample {
    foo: string;
    bar: number;
}

query<Sample>({
    //We want to put on the "foo" operator "$in"
    value: {
        //Intellisense then no output
    }
});

Expected behavior:
Intellisense should display all available options.
For example:
$elementMatch
$in

Actual behavior:
Intellisense does not offer anything.
If the "[P in key of T]" is replaced by "[key: string]", then the Intellisense for operators begins to work, but in this case we lose the test fields.

Operators、Filter、query を使用した TypeScript 2.1.5 のサンプルで IntelliSense の失敗を再現します。まず、マップ型 [P in keyof T] の補完処理を追跡します。$elementMatch と $in のオプションが、マップされたフィールドのチェックを失うことなく演算子オブジェクト内に表示されれば完了です。