(class x) returns a JVM-faithful Class value

class / .getClass now return a Class value that renders like the JVM —
(str c)/.toString -> "class <name>", pr -> "<name>", .getName/.getSimpleName/
.getCanonicalName work — but stays = and hash equal to its name string, so
(= (class x) String), class-keyed maps, multimethod dispatch on class, and
instance? keep working against the bare class-name tokens. instance? unwraps
a Class passed as the type arg.

clojure.test/class-match? no longer assumes (class e) is a string (a jolt-ism;
on the JVM a Class isn't a string either) — reads the name via .getName.

Matches JVM Class.toString, which libraries surface in error messages
(clojure.data.json DJSON-54 expects "...of class java.net.URI"). data.json
suite 139/139 bar the one UTF-16 surrogate test (Unicode-scalar char model).

5 corpus rows certified vs JVM; make test + shakesmoke green, 0 new divergences.

stdlib/clojure/test.clj

@@ -74,8 +74,9 @@
   (let [w (last-seg wanted)]
     (if (or (= w "Exception") (= w "Throwable"))
       true
-      (let [c (class e)]
-        (and (string? c) (= (last-seg c) w))))))
+      (let [c (class e)
+            cn (cond (nil? c) nil (string? c) c :else (.getName c))]
+        (and cn (= (last-seg cn) w))))))
 
 ;; --- assertion macros ------------------------------------------------------