Array.from doesn't work with some iterables

[ecolui]

Consider the following code.

const l_array = ['a', 'b', 'c'];
const l_it = l_array[Symbol.iterator]();            //convert to iterator
var result = Array.from(l_it);

When that code is called from JavaScript's native Array.from, the result is ['a', 'b', 'c']

When that function is called from prototype.js Array.from, the result is []
https://github.com/prototypejs/prototype/blob/master/src/prototype/lang/array.js

[timkingman]

This also breaks Google Maps (new today or very recently?). Removing the Array.from = $A line fixes Google Maps, but I'm not sure if I've broken any of my other ancient Prototype code.