docs: def get_many(self, keys):
          """
          Fetch a bunch of keys from the cache. For certain backends (memcached,
          pgsql) this can be *much* faster when fetching multiple values.
          Return a dict mapping each key in keys to its value. If the given
          key is missing, it will be missing from the response dict.
          """
          d = {}
          for k in keys:
              val = self.get(k)
              if val is not None:
                  d[k] = val
  
          return d