@Contract("null -> null; !null -> !null")
  @Nullable
  public static String boxIfPossible(@Nullable String type) {
    if (type == null) return null;
    final String s = ourBoxedTypes.get(type);
    return s == null ? type : s;
  }
@Contract("null -> null; !null -> !null")
  @Nullable
  public static String boxIfPossible(@Nullable String type)