On 5 Mar 2014, at 17:19, Domenic Denicola <domenic at domenicdenicola.com> wrote: > Personally I think the more useful model to follow than `String.prototype.contains` is `Set.prototype.has`. But then DOM4 `DOMStringList` would still have its own `contains` _and_ the `has` it inherits from `Array.prototype`. That seems confusing, no?