IOS8 IndexedDB Blob support

I can't find anyone else working on this online, but I'm having a problem saving blobs to IndexedDB in iOS8.

Here's an example: http://robnyman.github.io/html5demos/indexeddb/

This page grabs the image, saves it to IndexedDB and then creates a URL object to display it, and it works well in Chrome and FireFox.

In Safari on iOS8.0 (and 8.1 beta) the object refuses to store the console when connected to a Mac, I get this:

DOM IDBDatabase Exception 25: The stored data cannot be cloned using the internal structured cloning algorithm.

Any ideas? Is it just not implemented? To be honest, I can't find any documentation on the iOS8 IndexedDB implementation.

Thank!

Edit: This is still a problem on iOS9