I sometimes want to get a count of the values in a facet - if it's a facet of US states for example I want to know if all 50 are represented.

Idea: if ?_facet_size=max is present, add a count to the facet heading. So on:

https://latest.datasette.io/fixtures/compound_three_primary_keys?_facet=content&_facet_size=max&_facet=pk1&_facet=pk2#facet-pk2

It could have something like this:

Note that the first column shows >1000 - because in that case we've truncated the facet calculation since the maximum allowed returned rows is 1000.