It seems like there could be a sort of quirks mode for old JS libraries, in which browsers recognise either key functions or specific hashes and could then appl

It seems like there could be a sort of quirks mode for old JS libraries, in which browsers recognise either key functions or specific hashes and could then apply library-specific mitigations. It wouldn't solve every instance of this problem, but it would solve the mootools-using majority without needing the awkward name change.