Dec 2, 2022
the range until operator is a preview feature on 1.7.20. With that version ' languageVersion = "1.8" ' enables that. See also:
https://github.com/lotharschulz/Kotlin-Ranges-New-Until/blob/main/app/build.gradle.kts#L6-L10
https://www.lotharschulz.info/2022/10/03/setup-new-kotlin-range-operator-rangeuntil/