src/Backend/ArrayCache.php
public function doContains($id)
    {
        // isset() is required for performance optimizations, to avoid unnecessary function calls to array_key_exists.
        return isset($this->data[$id]) || array_key_exists($id, $this->data);
    }
public function doContains($id)
    {
        // isset() is required for performance optimizations, to avoid unnecessary function calls to array_key_exists.
        return isset($this->data[$id]) || array_key_exists($id, $this->data);
    }
{@inheritdoc}