I really don't like using the name "with". It's pretty confusing IMO. Plus, you can't destructure it because it's a keyword. With Array.prototype.with, it's

I really don't like using the name "with". It's pretty confusing IMO. Plus, you can't destructure it because it's a keyword. With Array.prototype.with, it's now array.with(0, 3), which isn't exactly the most descriptive signature in the world.