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CoffeeScript can't help you there.

It can and does. Coffeescript will never write:

["dog","cat"].forEach(function(animal){ console.log(animal) });

Which will run just fine on your development browser, but will break for real customers.

FYI, I don't use coffeescript, but I am at least aware of some problems with Javascript.

CoffeeScript will write that if you tell it to:

[1, 2].forEach (i) => alert i

Array.prototype.forEach and friends are trivial to shim and shouldn't be broken for anybody.

But jQuery can. Which was the argument.