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The Fibonacci comparison is a poor example of performance gains because Ruby is using large number data types to ensure the correct result. This is according to the crystal language website itself.

"However, Crystal might give incorrect results, while Ruby makes sure to always give the correct result."

https://crystal-lang.org/2016/07/15/fibonacci-benchmark.html

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That is true. Ruby does a lot in the background and one of the reason why it is slow

i actually think it's a good example for just that reason. Ruby will automatically use those big number types on production applications as well as the fibonacci application, so it's demonstrating that difference and the effect that it has.

This isn't true. Ruby uses native integers when possible and then switches to bignums when the integer gets big enough.

Yeah and that behavior of automatically switching has overhead, and should be taken into account when comparing languages.

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