code: def _convert_hex_str_to_int(val):
      
      if val is None:
          return None
  
      hex_num = int(val, 16)
      #  ensure it fits into 64-bit
      if hex_num > 0x7FFFFFFFFFFFFFFF:
          hex_num -= 0x10000000000000000
  
      assert -9223372036854775808 <= hex_num <= 9223372036854775807
      return hex_num
docs: Convert hexadecimal formatted ids to signed int64