code: def load_key_strict(key_name)
        meta = ensure_metadata_exists(key_name)
        reload_if_missing(key_name, meta.source_key)
        if !exists_locally?(key_name) && !meta.default_provided?
          raise MissingAttribute, "`#{meta.source_key} is missing for #{@parent}`"
        end
        parse_key(meta, key_name)
      end
docs: Load the key and apply transformations to it, skipping the cache.
   @param key_name [Symbol] the key name
   @return [Object] the returned value
   @raise MissingAttribute if the attribute wasn't found and there isn't a default