docs: def btc_witness_script_deserialize(_script):
      """
      Given a hex-encoded serialized witness script, turn it into a witness stack
      (i.e. an array of Nones, ints, and strings)
      """
  
      script = None
      if isinstance(_script, str) and re.match('^[0-9a-fA-F]*$', _script):
          # convert from hex to bin, safely
          script = binascii.unhexlify(_script)
      else:
          script = _script[:]
  
      # pointer to byte offset in _script (as an array due to Python scoping rules)
      ptr = [0]
  
      witness_stack_len = read_var_int(ptr, script)
      witness_stack = []
  
      for _ in xrange(0, witness_stack_len):
  
          stack_item = read_var_string(ptr, script)
          witness_stack.append(stack_item)
  
      return witness_stack