Negative operator on variable in degrees

[tremby]

I'm doing

$rotation = 20deg
transform rotate(-$rotation)

I expect to get out transform: rotate(-20deg); but I'm getting out transform: rotate(-$rotation);.

I get the expected output if I use transform rotate(-($transform));.

This seems like a bug to me, or is this on purpose somehow?

[kizu]

Closing as a duplicate of #980.

This is kinda on purpose, but when we'd get to 1.0, we could change it.