class MyBrand
{
    private _a;
}

function test(strInput: string & MyBrand, numInput: number & MyBrand) {
    switch(strInput)
    {
        case "a": // error: Type '"a"' is not comparable to type 'string & MyBrand'
        return 1;
    }

    switch(numInput)
    {
        case 1: // error: Type '1' is not comparable to type 'number & MyBrand'
        return 1;
    }

    return 0;
}