Revert "Make concat also work on lists of bytes."

This reverts commit a0c5d9a.

src/parsy/__init__.py

@@ -166,23 +166,10 @@ def combine_dict(self, combine_fn: Callable) -> Parser:
 
  def concat(self) -> Parser:
  """
- Returns a parser that concatenates together the previously produced values.
-
- This parser will join the values using the type of the input stream, so
- when feeding bytes to the parser, the items to be joined must also be bytes.
+ Returns a parser that concatenates together (as a string) the previously
+ produced values.
  """
-
- @Parser
- def parser(stream: bytes | str, index: int) -> Result:
- joiner = type(stream)()
- result = self(stream, index)
- if result.status:
- next_parser: Parser = success(joiner.join(result.value))
- return next_parser(stream, result.index).aggregate(result)
- else:
- return result
-
- return parser
+ return self.map("".join)
 
  def then(self, other: Parser) -> Parser:
  """

tests/test_parsy.py

@@ -157,16 +157,11 @@ def test_combine_dict_skip_underscores(self):
  ).combine_dict(Pair)
  self.assertEqual(parser.parse("ABC 123"), Pair(word="ABC", number=123))
 
- def test_concat_str(self):
+ def test_concat(self):
  parser = letter.many().concat()
  self.assertEqual(parser.parse(""), "")
  self.assertEqual(parser.parse("abc"), "abc")
 
- def test_concat_bytes(self):
- parser = any_char.many().concat()
- self.assertEqual(parser.parse(b""), b"")
- self.assertEqual(parser.parse(b"abc"), b"abc")
-
  def test_generate(self):
  x = y = None