1.11 /fill Sticky Piston w/ Direction

I know that 1.11 /fill and /setblock use block data instead of block data. However, when I try to fill an area with sticky pistons facing up, it days that my data values are incorrect. I've tried the following with various capitalizations:

/fill x1 y1 z1 x2 y2 z2 sticky_piston {facing:up}
/fill x1 y1 z1 x2 y2 z2 sticky_piston {direction:up}
/fill x1 y1 z1 x2 y2 z2 sticky_piston direction:up

From what I've read, {direction:up} or perhaps {Direction:up} should be correct. What am I missing?

Block states should be in the format variable=value:

/fill x1 y1 z1 x2 y2 z2 sticky_piston facing=up

Block states are also still just an alternative to numeric data values. You can use data values if you wish:

/fill x1 y1 z1 x2 y2 z2  sticky_piston 1

From the curly brackets ({,}) and colon (:), it looks like you may be getting confused with NBT, which is separate from data values/block states.