The scale name does not apply with as_discrete()

[OLarionova-HORIS]

The scale name is not applied when as_discrete() is used:

from lets_plot import *
from lets_plot.mapping import as_discrete

LetsPlot.setup_html()

dat2 = dict(
    x = ["a", "a", "b"],
)

(ggplot(dat2) + 
 geom_bar(aes("x", fill=as_discrete("x"))) + 
 scale_fill_manual(name="O", values=["red", "blue"], labels=['No', 'Yes'])
)

Result:

Expected:
the legend title should contains "O"

Notebook example: here