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> The runtime performance of crystal executables are great, of course, comparable with C or C++ in the given web development domain
I don't think that's true. Crystal seems to be more in the ballpark of Go or Java:https://www.techempower.com/benchmarks/
https://github.com/chakra-core/ChakraCore/wiki/Architecture-...
I've found the source code to be quite readable too - albeit from a bug-finding perspective, not a strictly pedagogical one.
it's had an IRB-like REPL for years. It just wasn't built into the language. Admittedly it was limited compared to IRB but it was more than enough to test out quick ideas.
It's called ICR: Interactive Crystal
https://github.com/crystal-community/icr
the first release was back in 2017