The ext-ds extension (link) was updated to v2.0.0 recently: https://github.com/php-ds/ext-ds/releases/tag/v2.0.0

From the release notes (2026-04-12):

Major release: redesign from 11 types + 3 interfaces to 5 types + 1 interface.
New

Ds\Seq — ordered sequence (replaces Vector and Deque)
Ds\Heap — configurable heap, max-heap by default (replaces PriorityQueue)
Ds\Key — interface for custom key equality (replaces Hashable)
Functional constructors: \Ds\seq(), \Ds\map(), \Ds\set(), \Ds\heap()
Copy-on-write: clone and copy() are O(1), mutation during iteration is safe
Ds\Pair is now a readonly class

Changed

Ds\Map::values() returns Ds\Seq
Ds\Map::pairs() returns Ds\Seq
Ds\Map::keys() returns Ds\Set

Removed

Ds\Vector, Ds\Deque, Ds\Stack, Ds\Queue, Ds\PriorityQueue
Ds\Collection, Ds\Sequence, Ds\Hashable interfaces

Requires PHP >= 8.2.

PHPStan has a stub for ext-ds and some entries in the functionMap.php file that, due to the mentioned major changes, need updating.

I rewrote the stub file for ext-ds v2.0.0 and updated the function map.