Observable Collection Reduce Improper Parameters

[Andrei15193]

The reduce method on observable collection receives improper parameters when executing the callback.

The following code sample exposes the bug:

const observableCollection = new ObservableCollection<string>();
observableCollection.push("one", "two");
observableCollection
    .reduce(
        (result, item, index, collection) => {
            // result is actually the item
            // item is actually the item index
            // index is actually the observable collection
            // collection is undefined
            // The result array is actually provided through the callback context
        },
        []
    );