comment re potential redundant eval

src/js/matrix.js

@@ -399,6 +399,12 @@ Matrix.prototype.evaluateCellZXY = function(srcHostname, desHostname, type) {
         return Matrix.GreenIndirect;
     }
 
+    // TODO: There are cells evaluated twice when the type is '*'. Unsure
+    // whether it's worth trying to avoid that, as this could introduce 
+    // overhead which may not be gained back by skipping the redundant tests.
+    // And this happens *only* when building the matrix UI, not when 
+    // evaluating net requests.
+
     // Specific-hostname specific-type cell
     var r = this.evaluateCellZ(srcHostname, desHostname, type);
     if ( r === 1 ) { return Matrix.RedDirect; }