This patch release backports most of the improvements and bugfixes introduced in the Scala Next series up to the Scala 3.6.4 release.
All of the backported changes were proven to not break either binary or source compatibility, by testing the compilation of over 1500 projects using Scala 3 Open Community Build.
The ASM 9.8 upgrade has now been merged and will be included in Scala 2.12.21, 2.13.17, and 3.7.1. (I’ve suggested it be backported for 3.3.6 or 3.3.7, too.)