Strange behavior with geom_label() using boxstyle other than default (round) exept for round4

[TerryGamon]

Maybe I am missing something here (setting some parameters?) but at least 'square' should be straight forward.

import plotnine as p9
from plotnine.data import mtcars

(p9.ggplot(mtcars, p9.aes('wt', 'mpg', label='name'))
 + p9.geom_point()
 + p9.geom_label(boxstyle='round')
)

so far so good:

---

import plotnine as p9
from plotnine.data import mtcars
(p9.ggplot(mtcars, p9.aes('wt', 'mpg', label='name'))
 + p9.geom_point()
 + p9.geom_label(boxstyle='square')
)

ValueError: Incorrect style argument: 'square,pad=0.25,'

same issue with:

• 'circle'
• 'darrow'
• 'larrow'
• 'rarrow'
• 'roundtooth'
• 'sawtooth'
• 'square'

Thanks for your hard work! Wouldn't know what to do without plotnine!