add types to ConsiderProposition step

diff --git a/lib/DX/Step/ConsiderProposition.pm b/lib/DX/Step/ConsiderProposition.pm
index a4a98a9..59d55ab 100644 (file)
--- a/lib/DX/Step/ConsiderProposition.pm
+++ b/lib/DX/Step/ConsiderProposition.pm
@@ -4,7 +4,7 @@ use DX::Class;
 
 with 'DX::Role::Step';
 
-has proposition => (is => 'ro', required => 1);
+has proposition => (is => 'ro', isa => Proposition, required => 1);
 
 sub apply_to {
   my ($self, $ss) = @_;