protected final Object getOrNull0(int n) {
    return arr[n];
  }
Gets the indicated element, allowing {@code null}s to be returned. This method is protected so
that subclasses may (optionally) offer a safe type-checked public interface to their clients.

@param n {@code >= 0, < size();} which element
@return {@code null-ok;} the indicated element
android/android_framework/dex-maker/src/main/java/com/android/dx/util/FixedSizeList.java