Cleanup of mjsunit.js code and make assertEquals more strict.

test/mjsunit/const.js

Index: test/mjsunit/const.js
diff --git a/test/mjsunit/const.js b/test/mjsunit/const.js
index a48e82ded622cb4e5104cdfcbe9199ed51cb3e58..adb0b7ae3be4fb80a78fd0221bf0deffa42cf7db 100644
--- a/test/mjsunit/const.js
+++ b/test/mjsunit/const.js
@@ -50,20 +50,20 @@ f();
 var valueOfCount = 0;
 
 function g() {
-  const o = { valueOf: function() { valueOfCount++; return 42; } }
-  assertEquals(42, o);
+  const o = { valueOf: function() { valueOfCount++; return 42; } };
+  assertEquals(42, +o);
   assertEquals(1, valueOfCount);
   o++;
-  assertEquals(42, o);
+  assertEquals(42, +o);
   assertEquals(3, valueOfCount);
   ++o;
-  assertEquals(42, o);
+  assertEquals(42, +o);
   assertEquals(5, valueOfCount);
   o--;
-  assertEquals(42, o);
+  assertEquals(42, +o);
   assertEquals(7, valueOfCount);
   --o;
-  assertEquals(42, o);
+  assertEquals(42, +o);
   assertEquals(9, valueOfCount);
 }