arrows on point_intervals

[ASKurz]

I see you have added the arrow argument to geom_spike(). It would be really cool if you added the arrow option for point_intervals in other functions, such as stat_halfeye() and so on, so the ends of the point_intervals could be arrows.

[mjskay]

Hmm I suppose in principle I'm not opposed. It would also be one way for people to put the little vertical markers on the intervals that some people like using grid::arrow(angle = 90,ends = "both").

[mjskay]

Should work on the github version now:

library(ggplot2)
library(ggdist)
library(distributional)

ggplot() + 
  stat_slabinterval(
    aes(xdist = dist_normal(0,1)),
    arrow = arrow(angle = 90, length = unit(4, "pt"), ends = "both")
  )

[ASKurz]

I love it!