code: func NewMemory(policies Policies, namespace string) Cache {
  	return &memory{
  		policies: policies,
  		h:        isolated.GetHash(namespace),
  		data:     map[isolated.HexDigest][]byte{},
  		lru:      makeLRUDict(namespace),
  	}
  }
docs: // NewMemory creates a purely in-memory cache.