Bug in col2rgb?

col2rgb("#00000079", TRUE)

[,1]
red      0
green    0
blue     0
alpha  121

col2rgb("#00000080", TRUE)

[,1]
red    255
green  255
blue   255
alpha    0

col2rgb("#00000081", TRUE)

[,1]
red      0
green    0
blue     0
alpha  129


Any ideas?

Thanks,
Hadley

http://had.co.nz/