I'm proposing this mostly for fun/learning. We spent a lot of time optimizing our diffing algorithm in Objective-C++ (e.g. custom unordered_map, tables, structs). It's blazing fast, but I'm really curious how it would perform in Swift.

Parameters:

• Test with and without @objc protocol IGListDiffable { ... }
  • A big bottleneck in the diffing algorithm is objc_msgSend(...) for diffIdentifier and isEqual:
  • Should test a Swift implementation with and without the Objective-C messages
• The same input and output
  • Can omit experiments
• Compile for production
  • -Os for Objective-C
  • ??? for Swift

My hunch is that the current implementation will be faster, but I'd love to be proven wrong!