OK so deferreds and futures are just one example of a feature with multiple implementations. It seems a natural type of question to compare such implementations here on StackOverflow. So how should I tag them?
For comparisons between two implementations I could just tag the name of each implementation, but what about when comparing several?
You might say "But that would be a meta tag and meta tags are bad." Well that's one way to look at it, but actually it's very similar to why tags such as cross-browser and cross-platform and language-agnostic are used.
Is there a good tag for comparing implementations? If not what would be a good name for such a tag?