Specify what typeof should return for exotic objects

Fixes #512.

Author: TimothyGu

index.bs

@@ -103,6 +103,7 @@ urlPrefix: https://tc39.github.io/ecma262/; spec: ECMA-262
         text: %Promise_reject%; url: sec-promise.reject
         text: %Promise_resolve%; url: sec-promise.resolve
         text: %PromiseProto_then%; url: sec-promise.prototype.then
+        text: typeof; url: sec-typeof-operator
     type: const; for: ECMAScript
         url: sec-well-known-symbols
             text: @@iterator
@@ -6728,6 +6729,10 @@ of objects defined in this section has the value <emu-val>true</emu-val>.
 Unless otherwise specified, the \[[Prototype]] internal slot
 of objects defined in this section is {{%ObjectPrototype%}}.
 
+Unless otherwise specified, {{ECMAScript/typeof}} operator, when called on an
+exotic object that is not a [=function object=] defined in this section and
+other specifications, must return the string "<code>object</code>".
+
 Some objects described in this section are defined to have a <dfn id="dfn-class-string" export>class string</dfn>,
 which is the string to include in the string returned from Object.prototype.toString.