Kevin Smith (2013-11-13T17:54:13.000Z)
domenic at domenicdenicola.com (2013-11-17T18:11:54.814Z)
The only approximation that seems acceptable to me is one that (a) never has false negatives, and (b) provides a simple way for developers to receive notification on and fix false positives. Over in Dart they have implemented [zones](http://api.dartlang.org/dart_async.html).