Trying to assign to an un-named type

If you update to 1v61 now, you can get 2 bit graphics:

g = Graphics.createArrayBuffer(8,8,2);
g.setColor(1)      
g.drawLine(0,0,7,7)
g.setColor(2)      
g.drawLine(7,0,0,7)  

a = new Uint16Array(g.buffer)     
for (i in a) print((a[i]|0x10000).toString(2).substr(­1))         
1000000000000001
0010000000000100
0000100000010000
0000001001000000
0000000110000000
0000010000100000
0001000000001000
0100000000000010
RGRGRGRGRGRGRGRG

Does that help? That's why you'd want to un-interleave...