OptionaloptionsThe options the transform declares (SeriesTransformDefinition.inputs),
by the names its class takes: boxSize, range, lines, reversal.
An omitted option takes its default, and a size left at 0 is taken from
the history loaded with each setData.
A registered transform: heikin-ashi, renko, range-bars, line-break, point-figure or kagi once the transform tier is imported.
A transform choice: which one, and the options it was given. JSON-safe, so saved state carries it as it is.