Is this topological sorting？

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Hello, I'm new to learning the code for cortaze.
https://github.com/cortezaproject/corteza/blob/57721291b270d4ed9b9e625d7a17fca2cc6c27eb/pkg/wfexec/session.go#L444C25-L444C25
About workflow exec session's worker for step schedule algorithm, Is this topological sorting？And in parallel scenarios include exclusive gateway，is it work? Because one branch may finish before another branch.
Thanks for your answer.