> My memory was Mootools itself depended on bind, so it was significantly > more that broke, thus my conclusion. Someone (probably me!) should check > what it was that actually broke, exactly. :) > > Many things in MooTools Core depends on itself. https://github.com/mootools/mootools-core/commit/c8dc1ab7ab09cc82d20c0bd3b3e9d0e7aba92204
There are some critical features of MooTools that used the contains method back then: https://github.com/mootools/mootools-core/blob/3e7459cb4756475a80921bfde5c19a7c7edb64df/Source/Element/Element.js#L419
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