> the vars are usually compiled to the moral equivalent of a global variable holding a pointer to a function. This allows you to update the function if the developer redefines it in the REPL, but it comes at a performance cost (the JVM can't inline it or otherwise optimise it)
might be out of my depth but I find it surprising; I thought compilation through invokedynamic should be able to handle redefinition while still allowing inlining and other jit optimizations
