M __tests__/vnode.js → __tests__/vnode.js

@@ -77,6 +77,16 @@ vnode1.redraw({ node, vnode });
         expect(node.checked).toEqual(false);
     });
 
+    it("should handle falsy props when redrawing", () => {
+        const vnode1 = h("test-element", { q: 1});
+        const node = vnode1.render();
+        expect(node.q).toEqual(1);
+        const vnode = h("test-element", { q: 0});
+        vnode1.redraw({ node, vnode });
+        expect(node.q).toEqual(0);
+        expect(vnode1.props.q).toEqual(0);
+    });
+
     it("should handle non-string props as properties and not create attributes", () => {
         const v = h("div", {
             test: true,

M h3.js → h3.js

@@ -393,11 +393,10 @@ oldvnode.props[a] = newvnode.props[a];
           newvnode.props[a]
             ? node.setAttribute(a, "")
             : node.removeAttribute(a);
-        } else if (!newvnode.props[a]) {
+        } else if ([null, undefined].includes(newvnode.props[a])) {
           delete oldvnode.props[a];
           node.removeAttribute(a);
         } else if (
-          newvnode.props[a] &&
           newvnode.props[a] !== oldvnode.props[a]
         ) {
           oldvnode.props[a] = newvnode.props[a];