old_contents: from types import TracebackType
  from typing import NoReturn, Optional, Type, Union
  
  
  def to_bytes(
      x: Union[str, bytes], encoding: Optional[str] = None, errors: Optional[str] = None
  ) -> bytes:
      if isinstance(x, bytes):
          return x
      elif not isinstance(x, str):
          raise TypeError(f"not expecting type {type(x).__name__}")
      elif encoding or errors:
          return x.encode(encoding or "utf-8", errors=errors or "strict")
      return x.encode()
  
  
  def to_str(
      x: Union[str, bytes], encoding: Optional[str] = None, errors: Optional[str] = None
  ) -> str:
      if isinstance(x, str):
          return x
      elif not isinstance(x, bytes):
          raise TypeError(f"not expecting type {type(x).__name__}")
      elif encoding or errors:
          return x.decode(encoding or "utf-8", errors=errors or "strict")
      return x.decode()
  
  
  def reraise(
      tp: Optional[Type[BaseException]],
      value: Optional[BaseException],
      tb: Optional[TracebackType] = None,
  ) -> NoReturn:
      try:
          if value is None:
              value = tp()
          if value.__traceback__ is not tb:
              raise value.with_traceback(tb)
          raise value
      finally:
          value = None
          tb = None
  
new_contents: from types import TracebackType
  from typing import NoReturn, Optional, Type, Union
  
  
  def to_bytes(
      x: Union[str, bytes], encoding: Optional[str] = None, errors: Optional[str] = None
  ) -> bytes:
      if isinstance(x, bytes):
          return x
      elif not isinstance(x, str):
          raise TypeError(f"not expecting type {type(x).__name__}")
      elif encoding or errors:
          return x.encode(encoding or "utf-8", errors=errors or "strict")
      return x.encode()
  
  
  def to_str(
      x: Union[str, bytes], encoding: Optional[str] = None, errors: Optional[str] = None
  ) -> str:
      if isinstance(x, str):
          return x
      elif not isinstance(x, bytes):
          raise TypeError(f"not expecting type {type(x).__name__}")
      elif encoding or errors:
          return x.decode(encoding or "utf-8", errors=errors or "strict")
      return x.decode()
  
  
  def reraise(
      tp: Optional[Type[BaseException]],
      value: Optional[BaseException],
      tb: Optional[TracebackType] = None,
  ) -> NoReturn:
      try:
          if value.__traceback__ is not tb:
              raise value.with_traceback(tb)
          raise value
      finally:
          value = None
          tb = None
  
subject: Bring coverage back to 100%