Interface AmDataItem

The author's own record behind the mark — the object they put in series.data, which amCharts keeps untouched on every data item it makes.

get() answers with the chart's reading of a row (valueY, categoryX, the fields a series was told to bind), so a column the chart was never bound to — a censoring flag, a gene name, a study's weight — is reachable nowhere else. It is the row a co-located declaration's field names are resolved against, which is why it is typed unknown and narrowed once, in resolveFieldRef.