Allow falsy values for domData.get

packages/metal-dom/src/domData.js

@@ -1,5 +1,7 @@
 'use strict';
 
+import {isDef} from 'metal';
+
 const METAL_DATA = '__metal_data__';
 
 /**
@@ -21,7 +23,7 @@ class domData {
 		if (!name) {
 			return element[METAL_DATA];
 		}
-		if (!element[METAL_DATA][name] && initialValue) {
+		if (!isDef(element[METAL_DATA][name]) && isDef(initialValue)) {
 			element[METAL_DATA][name] = initialValue;
 		}
 		return element[METAL_DATA][name];
@@ -39,23 +41,18 @@ class domData {
 	/**
 	 * Sets Metal.js's data for the given element.
 	 * @param {!Element} element
-	 * @param {string=} name Optional Property from the data to be returned.
-	 * @param {*=} value Optional value to the set the requested property
-	 *     to if it doesn't exist yet in the data.
-	 * @return {!Object}
+	 * @param {string=} name Property from the data to be set.
+	 * @param {*=} value Value to be set on the element.
+	 * @return {!Object|*}
 	 */
 	static set(element, name, value) {
 		if (!element[METAL_DATA]) {
 			element[METAL_DATA] = {};
 		}
-		if (!name || !value) {
+		if (!name || !isDef(value)) {
 			return element[METAL_DATA];
 		}
-		if (!element[METAL_DATA][name] && value) {
-			element[METAL_DATA][name] = value;
-		} else if (element[METAL_DATA][name] && value) {
-			element[METAL_DATA][name] = value;
-		}
+		element[METAL_DATA][name] = value;
 		return element[METAL_DATA][name];
 	}
 }