public bool Save(string id, T value)
 {
     return(FilesystemSerializer.TrySerializeToFile(FilenameForId(id), new JsonSerializer <T>(), value));
 }
 public bool TryGetById(string id, out T value)
 {
     return(FilesystemSerializer.TryDeserializeFromFile(FilenameForId(id), new JsonSerializer <T>(), out value));
 }