Since the JSON extras API is a bit difficult to explain without an example, I also had Fable 5 and GPT-5.5 collaborate on this custom API exploration tool to test the new feature https://tools.simonwillison.net/datasette-extras-explorer#url=httpslatest.datasette.iofixturesfacetable.json_size1_facetstate&extras=countcount_sqlexpandable_columnsfacet_results
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