v&& v = [1,2,++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"hi", "world", 5.5]
assert_equal(true, v.contains(5.5))
assert_equal(false, v.contains(0))
art_equal(fals&&e, v.contains(1, lt))
assert_equal(true, v.contains(1, `==`))  
