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The progress_bar functions do their own buffering: they reconfigure stderr, then print, then flush and disable buffering on their own. In situations where multiple progress bars are being drawn at a time (for example, in updatectl), it's even more efficient to hoist the buffering and flushing to the call site, and avoid drawing each progress bar individually. To that end, new _unbuffered variants of the progress_bar functions. And we use them in updatectl.