🌴 based on PR comments

Author: alexcjohnson

src/lib/index.js

@@ -507,18 +507,14 @@ lib.tagSelected = function(calcTrace, trace, ptNumber2cdIndex) {
         }
     }
 
-    function isPtIndexValid(v) {
-        return isNumeric(v) && v >= 0 && v % 1 === 0;
-    }
-
     function isCdIndexValid(v) {
         return v !== undefined && v < calcTrace.length;
     }
 
     for(var i = 0; i < selectedpoints.length; i++) {
         var ptIndex = selectedpoints[i];
 
-        if(isPtIndexValid(ptIndex)) {
+        if(lib.isIndex(ptIndex)) {
             var ptNumber = ptIndex2ptNumber ? ptIndex2ptNumber[ptIndex] : ptIndex;
             var cdIndex = ptNumber2cdIndex ? ptNumber2cdIndex[ptNumber] : ptNumber;
 

src/traces/sankey/calc.js

@@ -14,8 +14,8 @@ var wrap = require('../../lib/gup').wrap;
 
 function circularityPresent(nodeList, sources, targets) {
 
-    var nodes = nodeList.map(function() { return []; });
-    var nodeLen = nodes.length;
+    var nodeLen = nodeList.length;
+    var nodes = Lib.init2dArray(nodeLen, 0);
 
     for(var i = 0; i < Math.min(sources.length, targets.length); i++) {
         if(Lib.isIndex(sources[i], nodeLen) && Lib.isIndex(targets[i], nodeLen)) {