code: def from_cache(self, section, name):
          
          cached_value = self.cache.get(
              self.get_cache_key(section, name), CachedValueNotFound)
  
          if cached_value is CachedValueNotFound:
              raise CachedValueNotFound
  
          if cached_value == preferences_settings.CACHE_NONE_VALUE:
              cached_value = None
          return self.registry.get(
              section=section, name=name).serializer.deserialize(cached_value)
docs: Return a preference raw_value from cache