polyfill.io library is no longer considered safe to use

I think this priority and issue tag makes sense.

Since it's about a 3rd party library this can be fixed in public without a security advisory, but should ideally be addressed quickly with a code change and new release(s).

This was originally "minor" since polyfill is just mentioned in comments, but it would be good to update/remove that even in a comment to avoid accidentally using the wrong cdn for the files.

abhiyanshu_rawat → changed the visibility of the branch 3456710-polyfill.io-library-is to hidden.

I have updated all the comments with polyfill-fastly.io to avoid accidentally using the wrong CDN for the files. Thanks.

That change looks good to me. Thanks.