docs: def config(env=DEFAULT_ENV, default=None, **overrides):
      """Returns configured REDIS dictionary from REDIS_URL."""
  
      config = {}
  
      s = os.environ.get(env, default)
  
      if s:
          config = parse(s)
  
      overrides = dict([(k.upper(), v) for k, v in overrides.items()])
  
      config.update(overrides)
  
      return config