David Bruant (2014-05-09T07:57:37.000Z)
domenic at domenicdenicola.com (2014-05-09T15:12:06.250Z)
Just to try to assess the unlikelihood and understand the cases where a ES5 code expectations aren't met: The only case where ES6 and ES5 may diverge is for Object.getOwnPropertyDescriptor where a Proxy may return something that cannot be expected from any ES5 object. The after-trap completes the property descriptor (and when completing picks specifically only data or accessor property), so code that expects a complete property descriptor cannot be broken. However, a divergence may only occur if, for instance, the code loops over the property descriptor properties or expects exactly 4 properties. Is that correct or am I missing cases?