FIX: changed from !(Object) to ===null comparison

src/context/extStore.js

@@ -73,11 +73,11 @@ class ExtStorage {
         /**
          * @type {ExtStorageType}
          */
-        this._type = (!type ? ExtStoreType.INDIVIDUALLY_WITHING : type);
+        this._type = (type === null ? ExtStoreType.CENTRALIZED_DOC_HEAD : type);
         /**
          * @type {OverwriteBehaviour}
          */
-        this._overwriteBehaviour = (!behaviour ? OverwriteBehaviour.REPLACE : behaviour);
+        this._overwriteBehaviour = (behaviour === null ? OverwriteBehaviour.REPLACE : behaviour);
     }
 
     /**
@@ -211,12 +211,14 @@ class ExtStorage {
 
             case ExtStoreType.COLLECTED_DOC_HEAD:
                 break;
+            case ExtStoreType.CENTRALIZED_DOC_HEAD:
+                break
 
             case ExtStoreType.CENTRALIZED_SEGMENT_BEGIN:
             case ExtStoreType.CENTRALIZED_DOC_FOOTER:
+            default:
                 this._type = ExtStoreType.CENTRALIZED_DOC_HEAD;
 
-            case ExtStoreType.CENTRALIZED_DOC_HEAD:
                 break
         }