docs: def constant_or_bytes(possible_constant):
      from .constants import _Constant
      from .constants import _constants_registry_by_hash
      """
      Utility function for getting a constant (that has already been registered) from a serialized constant (ie, bytes of its hash)
      """
      if _Constant in possible_constant.__class__.__bases__:
          result = possible_constant
      else:
          bytes_of_possible_constant = bytes(possible_constant)
          try:
              constant = _constants_registry_by_hash[bytes_of_possible_constant]
              result = constant
          except KeyError:
              result = bytes_of_possible_constant
      return result