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Title: GitHub - tc39/proposal-Array.prototype.includes: Spec, tests, reference implementation, and docs for ESnext-track Array.prototype.includes · GitHub

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	https://github.com/tc39/proposal-Array.prototype.includes#arrayprototypeincludes-proposal
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	https://github.com/tc39/proposal-Array.prototype.includes#status
the TC39 process	https://tc39.github.io/process-document/
is not web-compatible	http://esdiscuss.org/topic/having-a-non-enumerable-array-prototype-contains-may-not-be-web-compatible
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