Create objects without prototypes when used as map with arbitrary keys

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/docx/numbering-xml.js b/lib/docx/numbering-xml.js
index 9c86536..c747609 100644
--- a/lib/docx/numbering-xml.js
+++ b/lib/docx/numbering-xml.js
@@ -17,7 +17,7 @@ function Numbering(nums, abstractNums, styles) {
     );
 
     function findLevel(numId, level) {
-        return findLevelWithSeenNumIds(numId, level, {});
+        return findLevelWithSeenNumIds(numId, level, Object.create(null));
     }
 
     function findLevelWithSeenNumIds(numId, level, seenNumIds) {
@@ -63,7 +63,7 @@ function readNumberingXml(root, options) {
 }
 
 function readAbstractNums(root) {
-    var abstractNums = {};
+    var abstractNums = Object.create(null);
     root.getElementsByTagName("w:abstractNum").forEach(function(element) {
         var id = element.attributes["w:abstractNumId"];
         abstractNums[id] = readAbstractNum(element);
@@ -72,7 +72,7 @@ function readAbstractNums(root) {
 }
 
 function readAbstractNum(element) {
-    var levels = {};
+    var levels = Object.create(null);
 
     // Some malformed documents define numbering levels without an index, and
     // reference the numbering using a w:numPr element without a w:ilvl child.
@@ -110,7 +110,7 @@ function readAbstractNum(element) {
 }
 
 function readNums(root) {
-    var nums = {};
+    var nums = Object.create(null);
     root.getElementsByTagName("w:num").forEach(function(element) {
         var numId = element.attributes["w:numId"];
         var abstractNumId = element.first("w:abstractNumId").attributes["w:val"];