Inferred Type Predicates don't work with the Boolean function #58999

// Correctly infers type as string
const works: string[] = [...Array(5)]
    .map(v => {
        if (v %2 === 0) {
            return 'a string';
        }

        return null;
    })
    .filter(v => !!v);

// Doesn't work for some reason even though its basically the same
const doesntWork1: string[] = [...Array(5)]
    .map(v => {
        if (v %2 === 0) {
            return 'a string';
        }

        return null;
    })
    .filter(v => v);

// Cant infer Boolean working
const doesntWork2: string[] = [...Array(5)]
    .map(v => {
        if (v %2 === 0) {
            return 'a string';
        }

        return null;
    })
    .filter(Boolean);
const doesntWork3: string[] = [...Array(5)]
    .map(v => {
        if (v %2 === 0) {
            return 'a string';
        }

        return null;
    })
    .filter(v => Boolean(v));