I hope there aren't that many codebases still stuck on Scala 2.12 (@twitter 😉), but if yours is, this is a great resource to read. While it focuses on Spark, honestly, anyone making the jump to 2.13 will find it incredibly useful. It covers everything from essential compiler options and helpful plugins to the subtle changes in the standard collections library. #scala #spark #migration https://substack.com/home/post/p-151720625