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c1e5f5ddf6
We can't hold the write lock while waiting on close because isClosed was taking the read lock (and called while closing). Instead, I just got rid of the locks entirely. Now, we just check the context. Really, I'm not sure why we even have such an "is closed" check. I _think_ what we actually want is to lock to prevent closing until we've finished all atomic operations, but that's a larger change and I don't have enough understanding of this code to easily make that change.