docs: public static long getSizeAsLong(final String propertyName, final long defaultValue)
      {
          final String propertyValue = getProperty(propertyName);
          if (propertyValue != null)
          {
              final long value = parseSize(propertyName, propertyValue);
              if (value < 0)
              {
                  throw new NumberFormatException(propertyName + " must be positive: " + value);
              }
  
              return value;
          }
  
          return defaultValue;
      }