Moose 0.34 broke the ability to make a Meta class immutable. This is a

Moose 0.34 broke the ability to make a Meta class immutable. This is a
fix, though I'm not convinced it's the _right_ fix. An alternative
might be to ensure that attributes for Moose meta classes are always
Moose::Meta::Attribute objects instead of Class::MOP::Attribute
objects. Regardless, the test I added should be useful in exploring
alternative fixes.