ng-repeat won't work if my object keys starting with "$" and there is no error messages

[puncha]

<div ng-app='app'>
  <h1 ng-repeat='(key,val) in {"SimpleKey":"This works fine"}'>{{key}}:{{val}}</h1>
  <h1 ng-repeat='(key,val) in {"Key/$/FOO":"This works fine"}'>{{key}}:{{val}}</h1>
  <h1 ng-repeat='(key,val) in {"$/FOO":"This does NOT work fine!"}'>{{key}}:{{val}}</h1>
</div>

The related codes in angularjs:

if (collection.hasOwnProperty(key) && key.charAt(0) != '$') {
    collectionKeys.push(key); 
}

IMO, this is a limitation or a bug in AngularJs side. It is very inconvenient because each time to use ng-repeat to iterate over object keys, we need to ensure each key not start with $, or it won't work and there is no error messages.

Also there is a post on stackoverflow:
http://stackoverflow.com/questions/29141277/angularjs-ng-repeat-doesnt-work-if-the-key-starts-with

[wesleycho]

The $ prefix is considered semi-private to Angular (generally signifying API) - this is pretty well known, and I do not believe this should be modified in Angular.

[miraage]

$ and $$ are reserved AngularJS internal prefixes. You should not use them.

[Narretz]

Dupe of #6266