Definition mixins

[Raul-Sebastian Mihăilă]

I updated the proposal with sections for motivation, comparison with other
kinds of mixins and protocols.
https://github.com/raulsebastianmihaila/ecma262-definition-mixins-proposal

The protocols, in their current form, are a naive kind of mixin
imlementation. I think it's better to separate contracts from mixins and
it's possible to use them together for using the default implementations
that the protocols may provide.

Would any TC39 member like to champion this proposal?
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