@inthehands .. challenging, yet isn't really central to "put these things in a list". At the same time, the extra features of a non-intrusive list model have radical implications for my actual code. In neither case am I writing a list implementation, but my day to day world is made up of confronting the real life intersection between these powerful abstractions (which for many programmers would not even be differentiable) and actual running code.
OK, enough. 4/4