Mistakes in polyfills/shims made it harder for us to ship ES2015 a without breaking the web. If you use the same name, follow the spec well.https://twitter.com/mathias/status/791003447856394241 …
At least with TC39’s process, you know when the spec is “final”. At that point it’s possible to create a spec-compliant polyfill.
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The HTML Standard doesn’t have such a process (for good reasons IMHO), leading to premature polyfills.
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