Optionalautoscale'all' (default): extent of all data, re-derived when data changes. 'visible': extent of
the visible series inside the x zoom window, re-derived on zoom / pan / data updates with
hysteresis (kept until the data leaves the domain or spans < 60% of it). 'none': derived
once, then kept while data changes.
OptionalmaxFixed top of the domain (default: from the data)
OptionalminFixed bottom of the domain (default: from the data)
OptionalniceExpand data-derived ends to whole tick steps; fixed min / max stay exact (default: true)
y domain of a line chart (derived by the engine; see
setYDomain).