src/Sp/FixtureDumper/Converter/Handler/HandlerRegistry.php
public function addHandler($type, $format, $handler)
    {
        if (!is_callable($handler)) {
            throw new \InvalidArgumentException('$handler must be callable');
        }

        $this->handlers[$type][$format] = $handler;
    }
public function addHandler($type, $format, $handler)
    {
        if (!is_callable($handler)) {
            throw new \InvalidArgumentException('$handler must be callable');
        }

        $this->handlers[$type][$format] = $handler;
    }
{@inheritdoc}