coercing method arguments in MooseX::Declare

Hi, 


I wonder if coercion works on method arguments when using MooseX::Declare? 


I tried and could not make it work, maybe I expect too much. 




use MooseX::Declare; 


class Foo { 
use Moose::Util::TypeConstraints; 


subtype Target as 'Object' => where { 
$_->can('update') 
}; 



coerce Target => from 'Str' => via { 
$_->new_with_options; 
}; 
}; 


# How to specify coerce =>1 here ? 
method add_target (Target $target! ) { 


} 
}