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Since the JSON extras API is a little hard to explain without an example I also had Fable 5 and GPT-5.5 collaborate on this custom API explorer tool for trying out the new feature https:// tools.simonwillison.net/datase tte-extras-explorer#url=https%3A%2F%2Flatest.datasette.io%2Ffixtures%2Ffacetable.json%3F_size%3D1%26_facet%3Dstate&extras=count%2Ccount_sql%2Cexpandable_columns%2Cfacet_results