AssertJ never had a clear indication about Kotlin compatibility. However, in cases like #3728 (comment), we tried to maintain compatibility with Kotlin 1.9.
Apparently, incompatibilities like #2439 are being resolved by Kotlin 2, without requiring any changes to AssertJ.
For this reason, we should clearly state that support for Kotlin in AssertJ 4 is guaranteed only for Kotlin 2.0 or greater.
AssertJ never had a clear indication about Kotlin compatibility. However, in cases like #3728 (comment), we tried to maintain compatibility with Kotlin 1.9.
Apparently, incompatibilities like #2439 are being resolved by Kotlin 2, without requiring any changes to AssertJ.
For this reason, we should clearly state that support for Kotlin in AssertJ 4 is guaranteed only for Kotlin 2.0 or greater.