Under "Engine Updates and Fixes"
Enable indexing operations on System.Tuple and System.ValueTuple (#7633) (Thanks @SeeminglyScience!)
Enable indexing operations on objects that implement ITuple (#7633) (Thanks @SeeminglyScience!)
Both of these lines refer to the same PR, and the change was already included in 6.1 GA.
Under "Engine Updates and Fixes"
Both of these lines refer to the same PR, and the change was already included in 6.1 GA.