Re: [ServiceWorker] Cache transactions & fixing `addAll` (#823)

> If transaction wait for one another, and body streams can be js controlled in the future, do you worry about deadlocks?

What would you do to cause a deadlock this way? Deadlocking shouldn't be easy.

There's also:

```js
caches.open('foo', cache => {
  return caches.transaction('foo').then(tx => {
    tx.waitUntil(cache.put(request, response));
  });
});
```

…which would deadlock. That's one of the reasons I put `.transaction` on `caches` rather than `cache`, to make look odd to use a `cache` in a `cacheTransaction`'s `waitUntil`.

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https://github.com/slightlyoff/ServiceWorker/issues/823#issuecomment-174241152