docs: @SuppressWarnings("unchecked")
    public synchronized static <T extends TunableConstants> T get(Properties p, Class<T> c) {
      T cfg = getDefault(c);
      if (p != null
        && p.containsKey(TUNE_MARKER)
        && p.containsKey(cfg.getClass().getName() + ".tuning")) {
        cfg = (T) cfg.clone();
        apply(p, cfg);
      }
      return cfg;
    }