v2.0.0

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.