Current behavior:

.> view ##Nat

  ⚠️
  
  The following names were not found in the codebase. Check your spelling.
    ##Nat

.> names ##Nat

  😶
  
  I couldn't find anything by that name.

.> alias.type ##Nat Nat

  Done.

.> names ##Nat

  Type
  Hash:  ##Nat
  Names: Nat

.> view ##Nat

  -- Nat is built-in.

Desired behavior would be something like:

.> view ##Nat

  -- ##Nat is built-in.

.> names ##Nat

  There are no names for ##Nat

.> view ##Cat

  I don't have a built-in ##Cat

.> names ##Cat

  I couldn't find anything by that name.
  (I don't have a built-in ##Cat)

.> names ##Rat

  Type
  Hash:  ##Rat
  Names: Rat
  (I don't have a built-in ##Rat)

(Struggling to come up with a good phrasing for "I don't have a" that doesn't necessarily imply that the definition exists in some other version of ucm; maybe it's fine, but suggestions are welcome.)