MAIDR JavaScript API
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    READ: ReadonlySet<string> = ...

    Everything the adapter reads.

    Every series type this adapter has measured now has a reading, so nothing is refused for want of one. A type outside this set is still refused by name rather than mapped onto whichever trace is closest -- an ECharts extension such as wordCloud registers its own, and core gains types between releases.

    Two of the readings carry no outline, for reasons measured off the drawing rather than assumed; grid.ts's footer records both.

    Exported because EChartsSeriesType is the public statement of this set and the two have to agree. They drifted once already: tier 2b added heatmap and candlestick here and left the union naming six types, so the published type refused a series the adapter reads. test/adapters/echarts/cartesian.test.ts now fails if they disagree in either direction.