message: Enable on GraphQL TypeModel
  Summary: Remove unnecessary assertion on the number of ctors on models with existing type tags.
diff: @@ -560,9 +560,6 @@ void ModelMethodMerger::merge_ctors() {
  dispatches.emplace(dispatch);
  }
  // Update mergeable ctor map
  - if (m_model_spec.has_type_tag) {
  - always_assert(dispatches.size() == 1);
  - }
  for (auto type : pair.first->mergeables) {
  for (auto dispatch : dispatches) {
  m_mergeable_to_merger_ctor[type] = dispatch;
  