Keyboard.addCallbacks didn't check to see if the arguments were null, only if they were undefined making the jsdocs misleading.

Author: photonstorm

README.md

@@ -307,6 +307,7 @@ can be controlled per-input mode.
 * Under setTimeOut (or when `forceSetTimeOut` was true) the Time was incorrectly setting `Time.timeExpected` causing game updates to lag (thanks @satan6 #2087)
 * Fixes edge case when TilingSprite is removed before render (thanks @pnstickne #2097 #2092)
 * Camera.setBoundsToWorld only adjusts the bounds if it exists (thanks @prudolfs #2099)
+* Keyboard.addCallbacks didn't check to see if the arguments were `null`, only if they were `undefined` making the jsdocs misleading.
 
 ### Pixi Updates
 

src/input/Keyboard.js

@@ -120,17 +120,17 @@ Phaser.Keyboard.prototype = {
 
         this.callbackContext = context;
 
-        if (typeof onDown !== 'undefined')
+        if (onDown !== undefined && onDown !== null)
         {
             this.onDownCallback = onDown;
         }
 
-        if (typeof onUp !== 'undefined')
+        if (onUp !== undefined && onUp !== null)
         {
             this.onUpCallback = onUp;
         }
 
-        if (typeof onPress !== 'undefined')
+        if (onPress !== undefined && onPress !== null)
         {
             this.onPressCallback = onPress;
         }