The numeric parameter ranges a method's configuration declares
Source:R/plots_utils.R
style_numeric_ranges.RdMirrors the selection make_labels_from_parameters() makes, so
the ranges line up with the numbers that end up in the labels: a parameter
is shown when it says so through display, or when its range holds more
than one value. Non-numeric ranges are skipped - a categorical parameter
has no ramp to sit on.