Intercepting JavaScript prototypal inheritance

intercept.js

let p = console.log;

let Interceptor = { hi:_=>"I am "+this.name }

function Person(name) {
	this.name = name;
}
Person.prototype.hi = function() {
	return "Hello, I'm "+this.name
}

let bob = new Person('Bob');
p( bob.hi() );
// Hello, I'm bob

Object.setPrototypeOf(bob, Interceptor);
p( bob.hi() );
// I am undefined