add String type + use String to make nominal types unique (worse, but more pleasant when debugging)

primitives/char.js

@@ -0,0 +1,11 @@
+import { typedFnType } from "../type_registry.js";
+import {Type} from "../metacircular.js";
+import {Char, Bool} from "./symbols.js";
+
+const eq = x => y => x === y;
+
+export const ModuleChar = {l:[
+  {i: Char, t: Type},
+
+  ...typedFnType(eq, fnType => fnType({in: Char, out: fnType({in: Char, out: Bool})})),
+]};