Question: list density plot bug - can anyone confirm?

There's a bug when using colorstyle=HUE.  Maple isn't displaying the proper number color values.

restart;
with(plots):

a:=Matrix(1..4,1..4,rand(1..4)):

listdensityplot(a)

listdensityplot(a,colorstyle=HUE)

The colorstyle=HUE only shows 3 colors (value 1 = value 4) but it seems ok in the greyscale plot (4 different values, 4 different shades).  Seems to me like the HUE scale is n-1 number of values short. 

Looks like a bug? 

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