Symfony4: createForm expect a string not a Type.

[brunonic]

in FormFlow.php

// createFormForStep

return $this->formFactory->create($formType, $this->formData, $options);

$formType must be a string.

Then when I do something like

$form = $exempleFlow->createForm();

I got this

Expected argument of type "string", "App\Form\ExempleType" given

[craue]

See https://github.com/craue/CraueFormFlowBundle/pull/320#issuecomment-552805996.