Type generation and Relationships in Typescript

Hello 👋, quick question about Type generation and Relationships in Typescript. There might be an "issue" using createDocument for relations, only the parameter $id is required, but the Type generation assigns whole type. What would be the ideal way to deal with it?

appwrite.d.ts

export type Items = Models.Document & {
    name: string;
}

export type Users = Models.Document & {
    username: string;
}

export type Favorites = Models.Document & {
    item: Items;
    user: Users;
}

databases.createDocument(
    ID.unique(),
    {
        item: items.$id, // Error: Type string is not assignable to type Items
        user: users.$id, // Error: Type string is not assignable to type Users
    },
);

And also, the appwrite.d.ts generator write the type name as plural (Items, Users, Favorites) instead of singular (Item, User, Favorite), is it intentional? From source code I found that it uses the collection name, but automatically creating singular from plural would be more appropriate? Is it recommended to use singular name of the collection to avoid this?