use a compatitable way

src/decorators/register.ts

@@ -125,7 +125,7 @@ function schemasFromDict<T>(dict: SchemaOptionsDict<T>) {
         resolvePropertySchemaFromOptions(schemaOptions),
       );
     } else {
-      schema.set(_key, schemaDict[_key]);
+      schema.dict[_key] = schemaDict[key] as Schema<T[keyof T]>;
     }
   }
   return schema;