Override the behavior of instanceof

`instanceof` doesn't work for primitive types.

If you want to use `instanceof` all the time, then you can override the behavior of `instanceof` by implementing a static method with the key of `Symbol.hasInstance`. In the following code, we create a class called `PrimitiveNumber` that checks if a value is a number:

class PrimitiveNumber {
    static [Symbol.hasInstance](value) {
        return typeof value === 'number';
    }
}

12345 instanceof PrimitiveNumber; // true
'helloworld' instanceof PrimitiveNumber; // false