Just a little point, is it intentional that:

testImplementation("io.kotest.extensions:kotest-assertions-arrow:_")
    testImplementation("io.kotest.extensions:kotest-assertions-arrow-fx-coroutines:_")

aren't in arrow-stack? Since maybe they depend on specific arrow versions and their versions might differ, it might be easier to have them there too even though they're just for Kotest?

Hmm, this should in general not be an issue since Arrow follows semantic versioning 🤔 Normally frameworks like Spring only maintain version in their BOM from within the same group coordinate, right?

https://github.com/kotest/kotest-assertions-ktor is holding by 1.0.3... whereas Arrrow isn't... maybe you're right that boms go by group coordinates, but I'm just thinking where there could be one place to get all the versions that go together for the Arrow framework with testing deps too... especially since the coming changes will be breaking...