DetailList's selection property don't accept a Selection object with generic type.

[AkiraVoid]

I define Selection object like this:

const selection = React.useMemo(
    () => new Selection<INotification>(),
    []
);

Then in a DetailList, I passed the object to selection property, but I got:

TS2322: Type 'Selection<INotification>' is not assignable to type 'ISelection<IObjectWithKey>'.
  Types of property 'canSelectItem' are incompatible.
    Type '(item: INotification, index?: number | undefined) => boolean' is not assignable to type '(item: IObjectWithKey, index?: number | undefined) => boolean'.
      Types of parameters 'item' and 'item' are incompatible.
        Type 'IObjectWithKey' is missing the following properties from type 'INotification': guid, to, title, content, and 4 more.

The interface INotification extends IObjectWithKey.

But if I just define selection without generic type, every thing is ok.

[xinru-lin]

This error happens because the Type for the selection needs to have a key field. IObjectWithKey is just {key?: string}
So for custom types to work, include the optional key field in the type defintion.