Produces continuous, smooth results by interpolating between pairs of input and output values ("stops"). The
input may be any numeric expression (e.g.,
["get", "population"]). Stop inputs must be numeric literals in strictly ascending order. The output type must be
["linear"]: Interpolates linearly between the pair of stops just less than and just greater than the input.
["exponential", base]: Interpolates exponentially between the stops just less than and just greater than the input.
basecontrols the rate at which the output increases: higher values make the output increase more towards the high end of the range. With values close to 1 the output increases linearly.
["cubic-bezier", x1, y1, x2, y2]: Interpolates using the cubic bezier curve defined by the given control points.