fun getValueAsLong(defaultValue: long): long
Gets the value or null if none exists. If there are more than 1 longs in this value, gets the first one. This method should be used for tags of type #TYPE_UNSIGNED_LONG.
defaultValue - long: the long to return if tag's value does not exist or cannot be converted to a long.
Return
long: the tag's value as a long, or the defaultValue.