Regarding dynamic arrays. Right now it looks like I have a way to do nicely namespaced (macro based!) operator overloading for types (it was unclear whether it would be possible with the feature set or not), so with this actually being in the language the need for built-in dynamic arrays is smaller - since you can use the normal foreach on the dynamic type - and so it can be implemented as a library type. (I want to emphasize that operator overloading is not done by functions, but through macros in C3 - so it's different from C++)