Allow use of symbol for configuration top_namespace

Author: unused

lib/dry/schema/config.rb

@@ -46,7 +46,7 @@ class Config
         setting :backend, default: :yaml
         setting :namespace
         setting :load_paths, default: ::Set[DEFAULT_MESSAGES_PATH], constructor: :dup.to_proc
-        setting :top_namespace, default: DEFAULT_MESSAGES_ROOT
+        setting :top_namespace, default: DEFAULT_MESSAGES_ROOT, constructor: :to_s.to_proc
         setting :default_locale
       end
 

spec/integration/messages/namespaced_spec.rb

@@ -89,5 +89,12 @@
 
       expect(result.errors(full: true)[:post_body]).to eql(["(dry_validation) Post body must be filled"])
     end
+
+    it "allows symbol for top namespace" do
+      schema = Dry::Schema.Params do
+        config.messages.top_namespace = :dry_validation
+      end
+      assert_equal "dry_validation", schema.config.messages.top_namespace
+    end
   end
 end