michael@0: function x4(v) { return "" + v + v + v + v; }
michael@0: function testConvertibleObjectEqUndefined()
michael@0: {
michael@0:   var compares =
michael@0:     [
michael@0:      false, false, false, false,
michael@0:      undefined, undefined, undefined, undefined,
michael@0:      false, false, false, false,
michael@0:      undefined, undefined, undefined, undefined,
michael@0:      false, false, false, false,
michael@0:      undefined, undefined, undefined, undefined,
michael@0:      false, false, false, false,
michael@0:      undefined, undefined, undefined, undefined,
michael@0:      false, false, false, false,
michael@0:      undefined, undefined, undefined, undefined,
michael@0:     ];
michael@0:   var count = 0;
michael@0:   var obj = { valueOf: function() { count++; return 1; } };
michael@0:   var results = compares.map(function(v) { return "unwritten"; });
michael@0: 
michael@0:   for (var i = 0, sz = compares.length; i < sz; i++)
michael@0:     results[i] = compares[i] == obj;
michael@0: 
michael@0:   return results.join("") + count;
michael@0: }
michael@0: 
michael@0: assertEq(testConvertibleObjectEqUndefined(),  
michael@0: 	 x4(false) + x4(false) + x4(false) + x4(false) + x4(false) + x4(false) +
michael@0: 	 x4(false) + x4(false) + x4(false) + x4(false) + "20");
michael@0: