add interactive prompt

progress.txt

@@ -0,0 +1,17 @@
+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?
+