src/DataLoader.php
public function loadMany($keys)
    {
        if (!is_array($keys) && !$keys instanceof \Traversable) {
            throw new \InvalidArgumentException(sprintf('The "%s" method must be called with Array<key> but got: %s.', __METHOD__, gettype($keys)));
        }
        return $this->getPromiseAdapter()->createAll(array_map(
            function ($key) {
                return $this->load($key);
            },
            $keys
        ));
    }
public function loadMany($keys)
    {
        if (!is_array($keys) && !$keys instanceof \Traversable) {
            throw new \InvalidArgumentException(sprintf('The "%s" method must be called with Array<key> but got: %s.', __METHOD__, gettype($keys)));
        }
        return $this->getPromiseAdapter()->createAll(array_map(
            function ($key) {
                return $this->load($key);
            },
            $keys
        ));
    }
{@inheritdoc}