Crystal 0.18.0 released!Crystal 0.18.0 has been released! This is a huge release with many new language and standard library features, and a few breaking changes as well. Let’s review them. Union as a first class citizen Union types exist in the language since day one. However, they were types without a name. Sure, you could write Int32 | String in type expressions, but you couldn’t write Union(Int32, String) the same wa
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