Merge pull request #67 from janl/fix/set

Fix: disallow overwriting of global method instances referenced in prototypes

Author: janl

.github/workflows/node.js.yml

@@ -16,15 +16,14 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x, 14.x, 16.x]
+        node-version: [22.x, 24.x, 26.x]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v7
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
+      uses: actions/setup-node@v7
       with:
         node-version: ${{ matrix.node-version }}
-        cache: 'npm'
     - run: npm ci
     - run: npm run build --if-present
     - run: npm test

jsonpointer.js

@@ -23,7 +23,7 @@ function setter (obj, pointer, value) {
     part = untilde(pointer[p++])
     hasNextPart = len > p
 
-    if (typeof obj[part] === 'undefined') {
+    if (typeof obj[part] === 'undefined' || !Object.prototype.hasOwnProperty.call(obj, part)) {
       // support setting of /-
       if (Array.isArray(obj) && part === '-') {
         part = obj.length