[11.x] Fixed issue where Cache::forget() works differently if keys created with Cache::flexible when using Redis, DynamoDB, Memcached or Apc

src/Illuminate/Cache/ApcStore.php

@@ -101,6 +101,8 @@ public function forever($key, $value)
      */
     public function forget($key)
     {
+        $this->apc->delete("{$this->prefix}illuminate:cache:flexible:created:{$key}");
+
         return $this->apc->delete($this->prefix.$key);
     }
 

src/Illuminate/Cache/DynamoDbStore.php

@@ -435,6 +435,15 @@ public function restoreLock($name, $owner)
      */
     public function forget($key)
     {
+        $this->dynamo->deleteItem([
+            'TableName' => $this->table,
+            'Key' => [
+                $this->keyAttribute => [
+                    'S' => "{$this->prefix}illuminate:cache:flexible:created:{$key}",
+                ],
+            ],
+        ]);
+
         $this->dynamo->deleteItem([
             'TableName' => $this->table,
             'Key' => [

src/Illuminate/Cache/MemcachedStore.php

@@ -211,6 +211,8 @@ public function restoreLock($name, $owner)
      */
     public function forget($key)
     {
+        $this->memcached->delete("{$this->prefix}illuminate:cache:flexible:created:{$key}");
+
         return $this->memcached->delete($this->prefix.$key);
     }
 

src/Illuminate/Cache/RedisStore.php

@@ -235,6 +235,8 @@ public function restoreLock($name, $owner)
      */
     public function forget($key)
     {
+        $this->connection()->del("{$this->prefix}illuminate:cache:flexible:created:{$key}");
+
         return (bool) $this->connection()->del($this->prefix.$key);
     }