| ⇢ | A | RecurrenceValidator added | |
| ⇢ | A | InvalidRruleException added |
| ⇢ | B | RecurrenceValidator::validate() added | |
| ⇢ | A | CountTransformer::validate() added | |
| ⇢ | A | DtStartTimezonedTransformer::validate() added | |
| ⇢ | A | IntervalTransformer::validate() added | |
| ⇢ | A | UntilTimezonedTransformer::validate() added | |
| ⇢ | A | DtStartTransformer::validate() added | |
| ⇢ | A | FreqTransformer::validate() added | |
| ⇢ | A | UntilTransformer::validate() added | |
| ⇢ | A | InvalidRruleException::__construct() added | |
| ⇢ | A | Recurrence::hasPeriodEndAt() added | |
| C | ↗ | B | RecurrenceProvider::create() improved |