Implement set trap for proxies, and revamp class hierarchy in preparation

test/mjsunit/typeof.js

Index: test/mjsunit/typeof.js
diff --git a/test/mjsunit/typeof.js b/test/mjsunit/typeof.js
index 86f9e0d62f13401a9dcfbb08322fa5f21c3365f9..8aa0ab1c3d8c767397d27f34e1c4790b483f9a6b 100644
--- a/test/mjsunit/typeof.js
+++ b/test/mjsunit/typeof.js
@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// The type of a regular expression should be 'function', including in
+// The type of a regular expression should be 'object', including in
 // the context of string equality comparisons.
 
 var r = new RegExp;
@@ -35,4 +35,3 @@ assertFalse(typeof r == 'function');
 
 function test(x, y) { return x == y; }
 assertTrue(test('object', typeof r));
-