Please see merge request 1235 [1] for an image of a repeat count for Gregorian chant that is generated according to \repeat in the ly code.
I learned of this notation only recently and I don't expect to use it myself except as a way to test LilyPond's data flow. Is anyone here interested in specifying the minimum features that this counter must have to deserve a place in LilyPond? I already know about the conflict between using BarLine or BreathingSign for divisions, and I hope to resolve that eventually. What about the counter per se? Thanks and regards, — Dan [1] https://gitlab.com/lilypond/lilypond/-/merge_requests/1235
