> > ES5 introspection APIs are enough, and if you're mixing in from an ES6 > class using old code, you face the same non-enumerable-methods surface that > you would with a built-in class.
True, and even more so, I like Andrea's point that mixing in getters and setters requires ES5 APIs anyway (i.e. Object.getOwnPropertyDescriptor). > It might be a pain to have to import a userland utility for such cases. >> > > How so? Meaning simply that `Object.mixin` (or whatever it might be called, or syntax) seems like a standard API gap. But I suppose it's a gap regardless of whether class methods are enumerable.
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