Math operations.

[dangreen]

Sample

.wizard-editor {
    transform: scale(50/1);
    transform: scale((50/1));
    transform: scale( (50/1) );
}  

libsass 3.5.5

.wizard-editor {
  transform: scale(50/1);
  transform: scale(50/1);
  transform: scale(50/1); }

libsass 3.3.2 (sassmeister)

.wizard-editor {
  transform: scale(50);
  transform: scale(50);
  transform: scale(50); }

expected

.wizard-editor {
  transform: scale(50/1);
  transform: scale(50);
  transform: scale(50); }

[mgreter]

This was quite probably changed with #1986. Sorry about that regression, but as we can see this has not been covered by our spec test yet (failing is always a painful and steady way to progress).