[6thaccount2]

> How well does the IDE warn I've made a type error before I've gone through a long compile & test iteration loop?

This doesn't really exist in a lot of dynamic languages and especially in Common Lisp, Clojure, APL, Forth, Smalltalk...etc. You write a small piece of code and interactively run it with some data...test if for some scenarios or build actual tests if you want. When it is good, add it to your actual code and you're done. You interactively test everything. Once you get used to it, anything without a REPL is like wading through quicksand. The type error would probably be caught quickly when using the REPL. In Common Lisp, when your code errors out, it drops you into the REPL and you can patch your code while it is running. Smalltalk also has this. Again, when you've seen this, a Java app crashing seems hokey.