I must admit although I was never much focused on either Lisp or Forth I tend to do lots of bottom up, no matter in what language. If I know I'll need a certain

I must admit although I was never much focused on either Lisp or Forth I tend to do lots of bottom up, no matter in what language. If I know I'll need a certain thing, for example a type to represent some kind of node or whatever, I'll build that thing before I write any code that would need to have that thing available in order to work. By the time I get started on the main task I usually have most or all of the necessary components verified. And I don't see why one should be apologetic about preferring that style.