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avoids buffer size issues (closes #48)
backward compatibility issue: before this, output could be read while inside the context manager, (and must be for large output to avoid blocking) while after it can only be read reliably after the context has finished.
We could try to use a more sophisticated approach that preserves both - infinite buffer size and safe read/write order, but this is the simplest fix that I think should work in all real-world cases.