-use Ref::Util qw(is_arrayref is_coderef is_hashref is_ref is_refref is_scalarref is_ref);
-use Scalar::Util qw(blessed isdual looks_like_number readonly refaddr);
+use Ref::Util qw(is_arrayref is_coderef is_hashref is_ref is_refref is_scalarref);
+use Scalar::Util qw(blessed readonly);