docs: public static FileSystemBinaryStore create( File directory, File trash ) {
          String key = directory.getAbsolutePath();
          FileSystemBinaryStore store = INSTANCES.get(key);
          if (store == null) {
              store = trash != null ? new FileSystemBinaryStore(directory, trash) : new FileSystemBinaryStore(directory);
              FileSystemBinaryStore existing = INSTANCES.putIfAbsent(key, store);
              if (existing != null) {
                  store = existing;
              }
          }
          return store;
      }