o.f()
func = o.f
func()
I don't know if it's really that bad that JS returns the unbound function when doing `obj.someFunc`, as it is consistent with any other property access: it returns the same thing that was assigned to that key in the object, or at some point in its prototype chain.
The really broken behavior, at least for me, is that when doing `var f = obj.someFunc(); f()`, the "this" gets bound to "window" in the f() call, instead of being null, or better yet raising an error whenever referenced, like an undefined variable.
NodeList.prototype.map = Array.prototype.map
document.querySelectorAll("div").map(function(ele){
return ele.id
});