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Crystal is not Ruby. Please do not advertise it as a drop in replacement. https://github.com/crystal-lang/crystal/issues/4731#issuecomment-318486278 https://git

Crystal is not Ruby. Please do not advertise it as a drop in replacement. https://github.com/crystal-lang/crystal/issues/4731#issuecomment-318486278 https://github.com/crystal-lang/crystal/issues/4731#issuecom... Imagine you have a big ruby project in production and you want to add static type checking. You won't be able to use Crystal for it, while the idea behind Diamondback Ruby is to be able to integrate it gradually.

nine_k 9y ago
Crystal is closer to Ruby in many aspects than e.g. Rust or Haskell or Nim. It might be an easier step into the land of static typing for someone acquainted to Ruby. It's not a static type checker for Ruby, though.