span direction (sign) now works

src/util/math.rs

@@ -40,6 +40,15 @@ macro_rules! impl_op {
                 }
             }
         }
+        impl const $op<$T> for f32 {
+            type Output = $T;
+
+            fn $fn(self, rhs: $T) -> Self::Output {
+                $T {
+                    $($field: self.$fn(rhs.$field),)*
+                }
+            }
+        }
         impl $opa<f32> for $T {
             fn $fna(&mut self, rhs: f32) {
                 $(self.$field.$fna(rhs);)*