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I wonder if Matz may consider even just adopting Crystal in the future, considering it is almost 99% compatible with Ruby and has 10x-20x performance gains out of the box.

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Crystal is far less compatible with Ruby than that. Simple methods/classes are valid but everything after that is completely different.

This. Some concepts and syntax are similar but they are quite different. I'm not saying that in negative sense - static typing with type inference rocks.

> I wonder if Matz may consider even just adopting Crystal in the future, considering it is almost 99% compatible with Ruby

This isn't even remotely true. Crystal syntax looks like Ruby. Crystal's semantics (the bit that matters) are not like Ruby.

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