I tried to write a non-trivial application in Crystal and have built some opinions on it: * It has nice features, seems decently fast (I wasn't able to fully t

I tried to write a non-trivial application in Crystal and have built some opinions on it: * It has nice features, seems decently fast (I wasn't able to fully test just how fast) * The language is complicated, there's so many built-in language constructs it doesn't fit in my head cleanly. I often found myself forgetting about entire features of the language by the time it was appropriate to use them * The stdlib is decently documented, has good coverage * Type system is top notch, tagged union types are the future of static typed languages IMO * It's very not mature. I encountered many poor error messages, seeming compiler errors, poorly documented behavior, etc.. It has potential, but I wouldn't recommend it for production use today.