Wait NSW uses first past the post in state and local elections?
A search later: it's preferential, but optionally so. https://elections.nsw.gov.au/candidate-handbook-nsw-state-by-elections/counting-and-results/legislative-assembly-voting-and-counting/examples-of-ballot-papers
I dunno if I'm a fan of less than 5 preferences being mandatory.
We must resist first past the post voting at all costs.