title: Simple write to Dexie without knowing the schema
body: <p>Is it possible to write an entire object to Dexie without knowing the schema?
  I just want to do this:</p>
  <pre><code>var db = new Dexie(gameDataLocalStorageName);
                  db.version(1).stores({
                      myData: &quot;gameData&quot;
                  });
                  db.myData.put(gameData);
                  console.log(db.myData.get('gameData'));
  </code></pre>
  <p>But I'm getting the following error:</p>
  <pre><code>Unhandled rejection: DataError: Failed to execute 'put' on 'IDBObjectStore': Evaluating the object store's key path did not yield a value.
   DataError: Failed to execute 'put' on 'IDBObjectStore': Evaluating the object store's key path did not yield a value.
  </code></pre>