Hah, good to know 
Even if claiming ordinal might be okayish, Iām still finding it difficult to imagine how the interface of literally every ordered collection could be respecified in a satisfactory way that wouldnāt also be considered hugely breaking, by any agreeable notion of what ābreakingā means. Maybe Iām just unimaginative, but Iām having trouble here.
Part of me is also beginning to suspect that the notion of ordinal indices for ordered collections is somehow related to the notion of tokens for unordered collections.