isFinal
Swift declarationvar isFinal: Bool { get }Whether this result is final at the time it is produced. * If `true`, then this result is final. There will be no later result over its range. * If `false`, then this result is volatile. There may or may not be a later result over this result's range. In particular, there is no guarantee that this result will be reissued with this property set to `true`. Equivalent to `resultsFinalizationTime >= range.end`.