def null_is_not_invalid():
assert is_invalid(None) is False
def falsy_objects_are_not_invalid():
assert is_invalid("") is False
assert is_invalid(0) is False
assert is_invalid([]) is False
assert is_invalid({}) is False
def nan_is_invalid():
assert is_invalid(nan) is True
def undefined_is_invalid():
assert is_invalid(Undefined) is True
def inf_is_not_invalid():
assert is_invalid(inf) is False
assert is_invalid(-inf) is False
def truthy_objects_are_not_invalid():
assert is_invalid("str") is False
assert is_invalid(1) is False
assert is_invalid([0]) is False
assert is_invalid({None: None}) is False
def undefined_is_invalid():
assert is_invalid(INVALID) is True