Array.prototype.contains solutions

[Fabrício Matté]

I faintly remember seeing a sort of "proposal" containing many different
approaches as how to solve this generic built-ins extensions problem in
future editions of ECMAScript.
I believe it was authored by Domenic Denicola, in Gist/GitHub format if
memory serves me right.

I can't seem to find it, does anyone have a link?
Or is memory tricking me and this thread was the end point for this topic?
Thanks.
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