Convert `obj` ToObject in Object.keys()

test/mjsunit/third_party/object-keys.js

 // Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // 1. Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //
 // 2. Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 // OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Based on LayoutTests/fast/js/Object-keys.html
 
-assertThrows(function () { Object.keys(2) }, TypeError);
-assertThrows(function () { Object.keys("foo") }, TypeError);
+assertEquals(Object.keys(2), []);
+assertEquals(Object.keys("foo"), ["0", "1", "2"]);
 assertThrows(function () { Object.keys(null) }, TypeError);
 assertThrows(function () { Object.keys(undefined) }, TypeError);
 
 assertEquals(Object.keys({}), []);
 assertEquals(Object.keys({a:null}), ['a']);
 assertEquals(Object.keys({a:null, b:null}), ['a', 'b']);
 assertEquals(Object.keys({b:null, a:null}), ['b', 'a']);
 assertEquals(Object.keys([]), []);
 assertEquals(Object.keys([null]), ['0']);
 assertEquals(Object.keys([null,null]), ['0', '1']);
@@ skipping 13 matching lines @@
 
 argsTest(1, 2, 3);
 
 var literal = {a: 1, b: 2, c: 3};
 var keysBefore = Object.keys(literal);
 assertEquals(['a', 'b', 'c'], keysBefore);
 keysBefore[0] = 'x';
 var keysAfter = Object.keys(literal);
 assertEquals(['a', 'b', 'c'], keysAfter);
 assertEquals(['x', 'b', 'c'], keysBefore);