Changes
* Make `Teds\strict_hash` ignore recursion caused by unrelated functions (e.g. var_dump calling `__debugInfo` calling `strict_hash`)
* Add `Teds\binary_search(array $values, mixed $target, callable $comparer = null, bool $useKey=false)`
* Change parent class of `Teds\StableMaxHeap` and `Teds\StableMinHeap` to `SplHeap`.
* Fix deduplication when constructing `StrictSet` from `iterable`, `StrictMap` from `Traversable`.
* Add `Teds\unique_values(iterable): array` using `strict_hash` to check for duplicates.