assert 5 is int
assert 5.9 is float
assert false is bool
assert "salut" is str

assert !(5 is float)
assert !(5.9 is bool)
assert !(false is str)
assert !("salut" is int)

assert [2, 4, 6] is array<int>
assert [[2, 4], [7, 9]] is array<array<int>>

assert int is type
assert type is type
assert (5.2 is int) is bool