code: @Nullable
    public static Long parseUnsignedIntObj (@Nullable final String sStr, @Nullable final Long aDefault)
    {
      return parseUnsignedIntObj (sStr, DEFAULT_RADIX, aDefault);
    }
docs: Parse the given {@link String} as unsigned {@link Integer} with radix
  {@link #DEFAULT_RADIX}.
  
  @param sStr
  The string to parse. May be <code>null</code>.
  @param aDefault
  The default value to be returned if the passed string could not be
  converted to a valid value. May be <code>null</code>.
  @return <code>aDefault</code> if the string does not represent a valid
  value.
  @since 9.0.0