If y is ordinal, chose a smarter default height based on the domain’s cardinality?

[mbostock]

Currently the height of a chart with a y-scale defaults to 396. It’d be nice if y were ordinal that we chose a height that’s appropriate based on the cardinality of the domain. E.g., perhaps ensuring a nice round bandwidth of exactly 19px pixels (with the default padding of 0.1). We’d probably want a minimum and maximum default height if we do this.

[mbostock]

(Possibly it needs to be multiplied by the cardinality of the fy domain when faceting?)