I still struggle to see the advantage of Option<T> in a language with null-safe accessors and unions

    function fnO(val?: number) {
        if (val == null) {
            return "NAH";
        } else {
            return (val * val).toString();
        }
    }

    test("testing Options", () => {
        let foo = undefined;
        let bar = 2;
        expect(fnO(foo)).toBe("NAH");
        expect(fnO(bar)).toBe("4");
    });

Your readme states

> FP's languages approach of rather not having null at all

But `None` is just another null / undefined, which brings along a bunch of non-idiomatic code around handling it.