Commit 5d68a57

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[Cache] Enable namespace-based invalidation by prefixing keys with backend-native namespace separators

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	`1`	`+<?php`
	`2`	`+`
	`3`	`+/*`
	`4`	`+ * This file is part of the Symfony package.`
	`5`	`+ *`
	`6`	`+ * (c) Fabien Potencier <fabien@symfony.com>`
	`7`	`+ *`
	`8`	`+ * For the full copyright and license information, please view the LICENSE`
	`9`	`+ * file that was distributed with this source code.`
	`10`	`+ */`
	`11`	`+`
	`12`	`+namespace Symfony\Contracts\Cache;`
	`13`	`+`
	`14`	`+use Psr\Cache\InvalidArgumentException;`
	`15`	`+`
	`16`	`+/**`
	`17`	`+ * Enables namespace-based invalidation by prefixing keys with backend-native namespace separators.`
	`18`	`+ *`
	`19`	+ * Note that calling `withSubNamespace()` MUST NOT mutate the pool, but return a new instance instead.
	`20`	`+ *`
	`21`	`+ * When tags are used, they MUST ignore sub-namespaces.`
	`22`	`+ *`
	`23`	`+ * @author Nicolas Grekas <p@tchwork.com>`
	`24`	`+ */`
	`25`	`+interface NamespacedPoolInterface`
	`26`	`+{`
	`27`	`+ /**`
	`28`	`+ * @throws InvalidArgumentException If the namespace contains characters found in ItemInterface's RESERVED_CHARACTERS`
	`29`	`+ */`
	`30`	`+ public function withSubNamespace(string $namespace): static;`
	`31`	`+}`

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