code: def validate_meta_object(meta: Dict[str, Any], allow_extra_meta_fields: bool) -> None:
      
      for key, value in meta.items():
          if key in META_FIELDS:
              if type(value) is not META_FIELDS[key]:
                  raise ValidationError(
                      f"Values for {key} are expected to have the type {META_FIELDS[key]}, "
                      f"instead got {type(value)}."
                  )
          elif allow_extra_meta_fields:
              if key[:2] != "x-":
                  raise ValidationError(
                      "Undefined meta fields need to begin with 'x-', "
                      f"{key} is not a valid undefined meta field."
                  )
          else:
              raise ValidationError(
                  f"{key} is not a permitted meta field. To allow undefined fields, "
                  "set `allow_extra_meta_fields` to True."
              )
docs: Validates that every key is one of `META_FIELDS` and has a value of the expected type.