1 is_dict_or_darray(null) = false
2 is_dict_or_darray("abc") = false
3 is_dict_or_darray(varray[1, 2, 3]) = false
4 is_dict_or_darray(vec[1, 2, 3]) = false
5 is_dict_or_darray(darray["a" => "a"]) = true
6 is_dict_or_darray(dict["a" => "a"]) = true
7 is_dict_or_darray(keyset[1, 2, 3]) = false
8 is_dict_or_darray(Vector{1, 2, 3}) = false
9 is_dict_or_darray(Map{"a" => "a"}) = false