perf(Scope): optimize $watchCollection when used for watching objects
Since we control the oldValue, we don't need to worry about proto-inhereted properties which means we can use 'for in' and skip hasOwnProperty checks. http://jsperf.com/for-in-vs-object-keys2
I
Igor Minar committed
e822e9061c2a605649d91abbd641f757e2829275
Parent: 301463a