src/Cache/ExtendedCache.php
public function deleteMultiple($keys)
    {
        $promises = [];
        foreach ($keys as $key) {
            //Ensure that Promise is always fulfilled
            $promises[] = $this->delete($key)->otherwise(function() { return true; });
        }
        return all($promises)->then(function() { return true; });
    }
public function deleteMultiple($keys)
    {
        $promises = [];
        foreach ($keys as $key) {
            //Ensure that Promise is always fulfilled
            $promises[] = $this->delete($key)->otherwise(function() { return true; });
        }
        return all($promises)->then(function() { return true; });
    }
{@inheritdoc}