You should check out Crystal, it's a similar story, speed of C with syntax of Ruby.
I've been using Crystal on the side for a while, see my posts here:
I also published several Crystal shards, e.g. a Bitcoin RPC client and a bloom filter.
There's a very interesting web framework called Lucky developed by a Thoughtbot employee. I contributed a bit in the very beginning but currently don't have time for that.
Also one should note that while Crystal and Ruby look similar, they're semantically quite different.
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