libmoosex-strictconstructor-perl 0.21-1 (amd64 binary) in ubuntu cosmic

 "use MooseX::StrictConstructor" instead of just "use Moose" makes your
 constructors strict. If your constructor is called with an attribute
 init argument that your class does not declare, then it calls
 "Carp::confess()". This is a great way to catch small typos.