Refine “high cardinality” warning#1668

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fil/refine-cardinality-warning

Jun 2, 2023

Commits on Jun 2, 2023

The intent of this “high cardinality” warning (as specified [here](https://github.com/observablehq/plot/pull/761#issuecomment-1043121845)) is the following: when a mark only¹ makes sense with group…
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