diff --git a/main.json b/main.json
index 58dc4c978d..0048f48824 100644
--- a/main.json
+++ b/main.json
@@ -17,15 +17,15 @@
   "checks": {
     // "accessControls": "ERROR",
     // "visibility": "ERROR"
-    "checkTypes": "ERROR",
-    "checkRegExp": "ERROR",
-    "checkVars": "ERROR",
-    "deprecated": "ERROR",
-    "fileoverviewTags": "ERROR",
-    "invalidCasts": "ERROR",
-    "missingProperties": "ERROR",
-    "nonStandardJsDocs": "ERROR",
-    "undefinedVars": "ERROR"
+    // "checkTypes": "ERROR",
+    // "checkRegExp": "ERROR",
+    // "checkVars": "ERROR",
+    // "deprecated": "ERROR",
+    // "fileoverviewTags": "ERROR",
+    // "invalidCasts": "ERROR",
+    // "missingProperties": "ERROR",
+    // "nonStandardJsDocs": "ERROR",
+    // "undefinedVars": "ERROR"
   },
 
   "jsdoc-html-output-path": "."
diff --git a/src/api/map.js b/src/api/map.js
index 8cdc4a9424..db0863e0a6 100644
--- a/src/api/map.js
+++ b/src/api/map.js
@@ -113,3 +113,15 @@ ol.Map.prototype.zoom = function(opt_arg) {
         return this.getZoom();
     }
 };
+
+/**
+ * @param {number=} opt_arg
+ * @returns {ol.Map|number|undefined} Map center.
+ */
+ol.Map.prototype.numZoomLevels = function(opt_arg) {
+    if (arguments.length == 1 && goog.isDef(opt_arg)) {
+        return this.setNumZoomLevels(opt_arg);
+    } else {
+        return this.getNumZoomLevels();
+    }
+};
diff --git a/src/ol/Map.js b/src/ol/Map.js
index 8516b360b6..14765241f4 100644
--- a/src/ol/Map.js
+++ b/src/ol/Map.js
@@ -42,12 +42,16 @@ ol.Map = function() {
 
 };
 
-ol.Map.prototype.defaults = {};
 /** 
+  @const
   @type {string} 
 */
-ol.Map.prototype.defaults.projection = "EPSG:3857";
-ol.Map.prototype.defaults.userProjection = "EPSG:4326";
+ol.Map.prototype.DEFAULT_PROJECTION = "EPSG:3857";
+/** 
+  @const
+  @type {string} 
+*/
+ol.Map.prototype.DEFAULT_USER_PROJECTION = "EPSG:4326";
 
 
 /**
@@ -63,7 +67,7 @@ ol.Map.prototype.getCenter = function() {
  */
 ol.Map.prototype.getProjection = function() {
     if (!goog.isDef(this.projection_)) {
-        this.projection_ = new ol.Projection(this.defaults.projection);
+        this.projection_ = new ol.Projection(this.DEFAULT_PROJECTION);
     }
     return this.projection_;
 };
@@ -74,7 +78,7 @@ ol.Map.prototype.getProjection = function() {
  */
 ol.Map.prototype.getUserProjection = function() {
     if (!goog.isDef(this.userProjection_)) {
-        this.userProjection_ = new ol.Projection(this.defaults.userProjection_);
+        this.userProjection_ = new ol.Projection(this.DEFAULT_USER_PROJECTION);
     }
     return this.userProjection_;
 };
diff --git a/test/spec/ol/Map.test.js b/test/spec/ol/Map.test.js
index 10f9ff4176..ac22a5c2af 100644
--- a/test/spec/ol/Map.test.js
+++ b/test/spec/ol/Map.test.js
@@ -63,8 +63,8 @@ describe("ol.Map", function() {
 
         center = map.center();
         zoom = map.zoom();
-        expect(center.x().toFixed(3)).toBe("1.000");
-        expect(center.y().toFixed(3)).toBe("2.000");
+        expect(center.x().toFixed(3)).toBe("4.000");
+        expect(center.y().toFixed(3)).toBe("5.000");
         expect(zoom).toBe(6);
         
     });