bit_write_T (Bit_Chain *restrict dat, BITCODE_T restrict chain)
{
  if (dat->version >= R_2007)
    return bit_write_TU (dat, (BITCODE_TU)chain);
  else
    return bit_write_TV (dat, chain);
}
bit_write_T (Bit_Chain *restrict dat, BITCODE_T restrict chain)
{
  if (dat->version >= R_2007)
    return bit_write_TU (dat, (BITCODE_TU)chain);
  else
    return bit_write_TV (dat, chain);
}