If you try this testcase (Firefox recommended, Safari just goes into an infinite ram eating mode) it should give a proper error message - instead it just goes into infinite recursion.

test("must not die on test failure", function() {
	var first = {};
	var second = {first:first};
	first.second = second;
	try {
		same(first, second); // same with equals
	}
	catch (exception) {
		ok( ! (/too much recursion/).test(exception.message), 'should never die of too much recursion error');
	}
});