One of the big downsides to being a hosted language like #Clojure is that, regardless of how awesomely stable the ideology with the language itself, you can't avoid problems if your host decides to make breaking changes. I am still doing damage control on the painful #Java 9+ #CoreChanges, where they decided it was time to shrink Java's core library and various dependent packages broke.
@worldsendless man java9 released 5 years ago. Clôjure is symbiotic language. You can blame the host, but not the the tool that let you leverage host.
