pretty print enhancements + comparison of generic functions

lib/meta/type_constructor.js

@@ -1,8 +1,13 @@
 import { getHumanReadableName } from "../primitives/symbol.js";
+import { inspect } from "util";
+import { prettyT } from "../util/pretty.js";
 
 const __makeTypeConstructor = (symbol, nAry, params) => {
   if (nAry === 0) {
-    return { symbol, params };
+    return {
+      symbol, params,
+      [inspect.custom](depth, options, inspect){ return options.stylize(prettyT(this), 'null'); },
+    };
   }
   // only for debugging, do we give the function a name
   const fName = `${getHumanReadableName(symbol).toLowerCase()}Type${params.length>0?params.length:''}`;