Another one I discovered today due to the changes to DateTime::modify

https://phpstan.org/r/213421a3-bdf9-4ee1-93b9-6e3cc368021a

It seems after an array_shift the whole static array is lost but IMO it should be able to retain the values as a union of static strings?

Originally posted by @Seldaek in #2851 (comment)