docs: def convert_bytes_to_bigbase(bytes_, alphabet=ALPHABET_27):
      r"""
      Args:
          bytes_ (bytes):
  
      Returns:
          str:
  
      Ignore:
  
      CommandLine:
          python -m utool.util_hash convert_bytes_to_bigbase
  
      Example:
          >>> # DISABLE_DOCTEST
          >>> from utool.util_hash import *  # NOQA
          >>> import utool as ut
          >>> bytes_ = b('9999999999999999999999999999999999')
          >>> alphabet = ALPHABET_27
          >>> result = convert_bytes_to_bigbase(bytes_, alphabet)
          >>> print(result)
          fervudwhpustklnptklklcgswbmvtustqocdpgiwkgrvwytvneardkpytd
      """
      x = _bytes_to_int(bytes_)
      if x == 0:
          return '0'
      sign = 1 if x > 0 else -1
      x *= sign
      digits = []
      bigbase = len(alphabet)
      while x:
          digits.append(alphabet[x % bigbase])
          x //= bigbase
      if sign < 0:
          digits.append('-')
          digits.reverse()
      newbase_str = ''.join(digits)
      return newbase_str