text: from dataclasses import dataclass
  
  
  @dataclass
  class MessageSizeValidationSettings:
      # pyre-fixme[8]: Attribute has type `int`; used as `None`.
      max_block_size_bytes: int = None
      # pyre-fixme[8]: Attribute has type `int`; used as `None`.
      max_tx_size_bytes: int = None
  