> Something that is often very hard to understand (it took me years to do so). Is that maintaining a language is insanely hard. Everything has a cost. Let me give a good example: A few years back someone submitted a patch that improved the error messages in Clojure. Worked great, just a single extra "if" and a message. It was committed to master. Then people's code got way slower. Why? Well this was a often used function and that single if blew the JVM inline budget causing that function to never be inlined. And that improvement had to he yanked out.