Add generics to cache item

Author: ossinkine

extension.neon

@@ -13,6 +13,7 @@ parameters:
 		consoleApplicationLoader: null
 	stubFiles:
 		- stubs/Psr/Cache/CacheItemInterface.stub
+		- stubs/Psr/Cache/CacheItemPoolInterface.stub
 		- stubs/Symfony/Bundle/FrameworkBundle/KernelBrowser.stub
 		- stubs/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.stub
 		- stubs/Symfony/Bundle/FrameworkBundle/Test/TestContainer.stub

stubs/Psr/Cache/CacheItemInterface.stub

@@ -2,6 +2,20 @@
 
 namespace Psr\Cache;
 
+/**
+ * @template TValue
+ */
 interface CacheItemInterface
 {
+    /**
+     * @return TValue
+     */
+    public function get();
+
+    /**
+     * @param TValue $value
+     *
+     * @return static
+     */
+    public function set($value);
 }

stubs/Psr/Cache/CacheItemPoolInterface.stub

@@ -0,0 +1,37 @@
+<?php
+
+namespace Psr\Cache;
+
+/**
+ * @template TValue
+ */
+interface CacheItemPoolInterface
+{
+    /**
+     * @param string $key
+     *
+     * @return CacheItemInterface<TValue>
+     */
+    public function getItem($key);
+
+    /**
+     * @param array<string> $keys
+     *
+     * @return array<CacheItemInterface<TValue>>|\Traversable<CacheItemInterface<TValue>>
+     */
+    public function getItems(array $keys = array());
+
+    /**
+     * @param CacheItemInterface<TValue> $item
+     *
+     * @return bool
+     */
+    public function save(CacheItemInterface $item);
+
+    /**
+     * @param CacheItemInterface<TValue> $item
+     *
+     * @return bool
+     */
+    public function saveDeferred(CacheItemInterface $item);
+}