Do any tracks implement the "grapheme cluster" tests for reverse-string?

These two tests

I don’t see any that do. Github query

org:exercism path:**/reverse-string/.meta/tests.toml "grapheme cluster"

Julia implements its own custom tests for grapheme clusters behind a flag: julia/exercises/practice/reverse-string/runtests.jl at main · exercism/julia · GitHub (not the ones you linked in canonical-data.json)

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Python hasn’t yet implemented those two test cases, but plans are afoot.

IIRC from the problem-spec discussions, Rust implements them – at least the first one, if not the second.