Allow dashes (-) in cache keys

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## [Unreleased]
 
+* The [PSR-6 definition on what makes a valid cache key](https://www.php-fig.org/psr/psr-6/#definitions), it is said that
+  keys must support keys consisting of the characters `A-Z`, `a-z`, `0-9`, `_`, and `.` in any order in UTF-8
+  encoding and a length of up to 64 characters. Implementing libraries MAY support additional characters and encodings
+  or longer lengths, but must support at least that minimum.
+  * Dashes (`-`) are now allowed in cache keys.
+
+
 ## [1.1.0] - 2024-03-02
 
 * The Cache can now be instantiated without providing a [PSR-20](https://www.php-fig.org/psr/psr-20/) clock implementation.

tests/CacheKeyTest.php

@@ -32,6 +32,7 @@ public static function validValues(): array
         return [
             'single char' => ['x'],
             '64 chars' => [str_repeat('x', 64)],
+            'all allowed chars' => ['aZ0_.-'],
         ];
     }