Do not return from lambda

So that MRI won't fail

Author: flash-gordon

lib/dry/initializer/plugins/type_constraint.rb

@@ -11,8 +11,10 @@ def call
       ivar = :"@#{rename}"
       lambda do |*|
         value = instance_variable_get(ivar)
-        return if value == Dry::Initializer::UNDEFINED
-        instance_variable_set ivar, type.call(value)
+
+        if value != Dry::Initializer::UNDEFINED
+          instance_variable_set ivar, type.call(value)
+        end
       end
     end
   end