ConstReadonlyCopy: CopyFills with a repeating values.
ReadonlyDateDays: DateFills using individual days.
ReadonlyDateMonthEnd: DateFills month by month, landing on the last day of each.
A template already on month ends fills this way under Series too — this is for asking for it outright, from a day-of-month the template does not otherwise imply.
ReadonlyDateMonths: DateFills using months.
ReadonlyDateWeekdays: DateFills business days, skipping Saturday and Sunday.
A template that only a business-day series explains — Fri, Mon, Tue — fills this way under
Series too; this is for asking for it outright, from a template a plain day series
would otherwise account for. A weekend anchor is taken rather than refused: the fill means
"give me business days from here".
ReadonlyDateYears: DateFills using years.
ReadonlyGrowth: GrowthFills a geometric series — each value the previous one times a ratio.
ReadonlyLinear: LinearFills a straight numeric series — the step read from the template, or given outright.
ReadonlySeries: Composite<any>Default Fills.
This attempts to fill use Dates, Linear, Ordinal, then List.
Available Builtin Types.