status:
  - everything is properly typed, up to the meta-circular level
  - primitives
  - structures: list, product, sum
     can compose structures, e.g., create list of list of product of sum of ...
     list type is specialized for ListOfByte to use Uint8Array
  - generics currently implemented in two ways:
      1) similar to "templates" (as in C++):
         a generic function or type is a function that takes a Type, and produces a specific variant
      2) experimental implementation of polymorphic types and type inferencing
         values currently treated as white-box, hardcoded generic types (e.g., list, function) in type inferencing algorithm

todo:
  - interfaces via typeclasses?

  - type inferencing can be reduced to finding a graph isomorphism?