Suggestion: set radius using 'npc' rather than 'pt'

[zerogetsamgow]

Using radius = unit(...,"npc") rather than radius = unit(...,"pt") would result in more stable and intuitive charting.

"npc" is normalised parent coordinates. So, setting radius = radius = unit(...,"npc") creates a column with a perfectly rounded top - the radius is half the width of the column (the `parent').

Better still unit could be set to accept values from 0 to 1 and this value is passed to unit internally to normalize over values of
unit(0/2,"npc") - a rectangle with no rounding - to unit(1/2,"npc") - a column with a perfectly round top. Limiting values in this way prevents columns with "wings" at the top that result from values like unit(>1/2,"npc") or unit("a large number"1/2,"pt").

I am using this approach for a wrapper function we use internally to my organisation to match our style guide.