> > It looks like apps using Ember.js are affected as well: 
> 
> > 
> 
> > <https://github.com/emberjs/ember.js/issues/5670>
> 

I would like to clarify that Ember is not actually affected by this. The 
specific problem was related not simply to an extension of A.p.contains, but 
also a reliance on that property being enumerable. Ember does not copy 
properties from A.p using enumerability, so this problem does not affect us.

The issue jdalton filed was much more humdrum: it was a request for Ember's 
(now) polyfill to be compatible with some edge-cases in the standardized 
A.p.contains. But as far as I can tell, Ember is not responsible for this web 
compat snafu.
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