DataSets are collections of DataEntries, and ChartData are collections of DataSets. Currently we have non-standard methods to access members of the collections (e.g. entryForIndex).

Due to the requirement of Objective-C compatibility, we are unable to do the proper thing and adopt Collection (and a few related protocols) in these classes. While we are able to implement specific functions to make them feel more "Swift-y", users will lose on out expected features that come for free with Collection conformance (such as map, reduce, filter).

Are there any thoughts with how to proceed in making collections feel more Swift like?