Ensure wait of _.debounce and _.throttle defaults to 0. [closes #991]

lodash.src.js

@@ -7376,7 +7376,7 @@
      * @memberOf _
      * @category Function
      * @param {Function} func The function to debounce.
-     * @param {number} wait The number of milliseconds to delay.
+     * @param {number} [wait=0] The number of milliseconds to delay.
      * @param {Object} [options] The options object.
      * @param {boolean} [options.leading=false] Specify invoking on the leading
      *  edge of the timeout.
@@ -7434,7 +7434,7 @@
       if (typeof func != 'function') {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
-      wait = wait < 0 ? 0 : wait;
+      wait = wait < 0 ? 0 : (+wait || 0);
       if (options === true) {
         var leading = true;
         trailing = false;
@@ -7955,7 +7955,7 @@
      * @memberOf _
      * @category Function
      * @param {Function} func The function to throttle.
-     * @param {number} wait The number of milliseconds to throttle invocations to.
+     * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
      * @param {Object} [options] The options object.
      * @param {boolean} [options.leading=true] Specify invoking on the leading
      *  edge of the timeout.

test/test.js

@@ -13889,6 +13889,28 @@
       ok(pass);
     });
 
+    asyncTest('_.' + methodName + ' should have a default `wait` of `0`', 1, function() {
+      if (!(isRhino && isModularize)) {
+        var callCount = 0;
+
+        var funced = func(function() {
+          callCount++;
+        });
+
+        funced();
+
+        setTimeout(function() {
+          funced();
+          strictEqual(callCount, isDebounce ? 1 : 2);
+          QUnit.start();
+        }, 32);
+      }
+      else {
+        skipTest();
+        QUnit.start();
+      }
+    });
+
     asyncTest('_.' + methodName + ' should call `func` with the correct `this` binding', 1, function() {
       if (!(isRhino && isModularize)) {
         var object = {