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kotlinlang

Hi,
I recently started <https://github.com/Sedose/codecrafters-interpreter-kotlin|a small Kotlin project> for the <https://app.codecrafters.io/courses/interpreter|"Build Your Own Interpreter" challenge>.
It's purely for practice and has no open-source value.
If you have time, I’d appreciate any feedback on Kotlin idioms, readability, and best practices.
Tests aren’t fully implemented yet — I'll add them once the overall structure is settled.
Thanks!

Just a very minor point: I only looked at a random file, as I didn't have time to look at it more thoroughly, and found `fun Char.isNumberChar() = isDigit() || this == '.'`. The `isDigit()` method includes digits in all languages; for example, `'१'.isDigit()` is true, but the language only accepts the ASCII '0' to '9' as valid digits for number literals.