static void customdata_weld(
    const CustomData *source, CustomData *dest, const int *src_indices, int count, int dest_index)
{
  if (count == 1) {
    CustomData_copy_data(source, dest, src_indices[0], dest_index, 1);
    return;
  }

  CustomData_interp(source, dest, (const int *)src_indices, nullptr, nullptr, count, dest_index);