Cache invalidation affects different Cache instances

[KminekMatej]

Version: 3.2.2

Bug Description

https://forum.nette.org/cs/36236-cache-invalidace-podle-patternu#p225445

$cache1 = new Cache($this->cacheStorage, 1);
$cache2 = new Cache($this->cacheStorage, 2);

$cache1->save("key1-1", "value-1-1", [Cache::Priority => 1]);

$cache2->save("key2-1", "value-2-1", [Cache::Priority => 1]);
$cache1->clean([
    Cache::Priority => 1
]);

Assert::null($cache1->load("key1-1"));
Assert::notNull($cache2->load("key2-1")); // Tester\AssertException: Value should not be null

Expected Behavior

Cache1 should not be involved in cleaning of Cache2 - since they have different namespace.

Possible Solution

Problem lies when both caches shares same Storage. Storage returns simply keys without respect to namespace. Namespace should probably be stored in cache storage and cleaning function should pay respect to that namespace.