Another one I just bumped into today that I'm surprised doesn't have more upvotes (or a priority set) is
https://youtrack.jetbrains.com/issue/KT-22228 . It documents workarounds needed to test suspend functions on JS. On a quick search it seems to be something that pops up as frequently asked in this slack. After watching "A look into the future" talk, it does seem the upvotes matter. Maybe we can get some more exposure on it here!