Elm looks extremely promising to me. However, I tried the Elm's implementation of TodoMVC here: http://evancz.github.io/TodoFRP/ and got an unusable list of strings with basically none of the features seen in other prototypes. Is it the one used in these benchmarks? What results would we see in an identical test?

Update: the benchmark uses a correct implementation available here: https://github.com/evancz/todomvc-perf-comparison/tree/maste... so it was a false alarm on my part. Tried it out at https://rawgit.com/evancz/todomvc-perf-comparison/master/tod...