Number literal unions are resolved as String

[Schahen]

interface Foo {
  primeSeed?: 2 | 3 | 5 | 7 | 11 | 13;
}

is converted to:

external interface Foo {
    var primeSeed: String? /* 2 | 3 | 5 | 7 | 11 | 13 */
        get() = definedExternally
        set(value) = definedExternally
}

while actually we expect Number

[Schahen]

Keep in mind that numeric literal is not necessarily integer