helper(s) to see Dict internal
toInternalRepresentation : DictDotDot.Dict k v -> List (InternalNode k v)
Reveal internal representation of Dict for advanced testing/debugging. This returns a list of nodes in sorted order. Each node has k/v, plus a path to the node that looks something like "llr", and the color of the node ("R" or "B").
Example output is something like this:
[{ color = "B", k = 1, path = "l", v = "one" },
{ color = "B", k = 2, path = "", v = "two" },
{ color = "R", k = 3, path = "rl", v = "three" },
{ color = "B", k = 4, path = "r", v = "four" }]