oldCollection always .equals(); never === to newCollection in $watchCollection

[dukehoops-zz]

Docs for $watchCollection 's listener say:

listener a callback function that is

• fired with both the newCollection and oldCollection as parameters.
• The newCollection object is the newly modified data obtained from the obj expression
• and the oldCollection object is a copy of the former collection data.

In my demo (http://plnkr.co/edit/WXGn5LaoiJmLzJ8rMImQ?p=preview - open JS console) I see:

1. (bug) oldCollection always .equals() newCollection - even when array is mutated or replaced altogether
2. (perhaps design flaw) oldCollection !== newCollection on first invocation - unlike in $watch. IMO behavior should be consistent between the two methods and on first invocation oldCollection must be === newCollection - to be able to easily tell that it is - in fact - first invocation

[Narretz]

duplicate of #2621
incomplete pull request in #5688

[pkozlowski-opensource]

Thnx @Narretz, it is indeed a duplicate. Closing this one.