backingStore API might not be quite right

[domenic]

It occurs to me you can't really use the IndexedDB database manually, once a StorageArea has opened it. (Unless we add explicit close(); see #13.)

As such, the only way to really use backingStore is:

const backingStoreInfo = (new StorageArea("foo")).backingStore;

But this is kind of awkward, creating a StorageArea with no intention of actually using it. Instead, maybe it should just be

const backingStoreInfo = StorageArea.backingStore("foo");

[domenic]

Wait, no, this is wrong, you can totally have multiple open connections to the same database at once. There's no problem here.

/cc @inexorabletash to double-check me.

[inexorabletash]

Confirmed. No problem here.