Check subclass of ObservableCollection<>

[kzrnm]

What changed?

Currently, If collection is subclass of ObservableCollection<>, IsObservableCollection(collection) returns false.
But I hope the method call returns true.

Sample

void Check()
{
    var result = new StringObservableCollection().IsObservableCollection();
   // I hope result is true, but it's false.
}
class StringObservableCollection : ObservableCollection<string> { }

[punker76]

@kzrnm your changes have been merged, thanks for your contribution 👍