message: Use `config` to transform CLI args.
diff: @@ -298,7 +298,7 @@ class Drake:
  elif hasattr(t, '__drake_configure__'):
  value = getattr(t, '__drake_configure__')(t, value)
  else:
  - value = t(value)
  + value = config(value, t)
  kwcfg[name] = value
  # Configure
  with self:
  