RDATE only adds dates without checking if dates are already present - expected behavior?

[scornelissen88]

Let's say I have this rule:

echo '<pre>';
$rule = new Rule('FREQ=WEEKLY;COUNT=10', new DateTime('next monday'));
$rule->setRDates([new DateInclusion((new DateTime())->setDate(2022,4,25), false)]);

foreach (
    (new ArrayTransformer)
        ->transform($rule)
    as $recurrence
) {
    var_dump($recurrence->getStart()->format('d-m-Y'));
}

This outputs the following:

string(10) "2022-04-18"
string(10) "2022-04-25"
string(10) "2022-05-02"
string(10) "2022-05-09"
string(10) "2022-05-16"
string(10) "2022-05-23"
string(10) "2022-05-30"
string(10) "2022-06-06"
string(10) "2022-06-13"
string(10) "2022-06-20"
string(10) "2022-04-25"

As you can see it's just adding the 25th a second time without checking if the 25th is already available in the recurrences. Not sure if this is expected behavior from the RFC or not?