When a series contains a data array that is longer than this, only
one dimensional arrays of numbers, or two dimensional arrays with
x and y values are allowed. Also, only the first point is tested,
and the rest are assumed to be the same format. This saves expensive
data checking and indexing in long series. Set it to 0 disable.
Note: In boost mode turbo threshold is forced. Only array of numbers or two dimensional arrays are allowed.