use Carp 'confess';
use Scalar::Util 'blessed', 'weaken';
-our $VERSION = '0.88';
+our $VERSION = '0.89';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
sub is_mutable { 0 }
sub is_immutable { 1 }
+sub _immutable_metaclass { ref $_[1] }
+
sub superclasses {
my $orig = shift;
my $self = shift;