Properties in union type not type checking

[OliverJAsh]

TypeScript Version: 2.7.2

Search Terms:
union

Code

type Photo = { id: string };

type UserWithoutPhotos = {
    name: string;
};

type UserWithPhotos = UserWithoutPhotos & { photos: Photo[] };

const user: UserWithoutPhotos | UserWithPhotos = {
    name: 'foo',
    // Expected type error, but got none
    photos: 1
};

[ghost]

Duplicate of #20863

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.