| qr_pb_ | R Documentation | 
This is an internal function used by qr_scan_js_from_corners
and qr_scan_cpp. It's a wrapper around progress_bar.
Can be disabled with options(list(progress_enabled = F)).
qr_pb_(prefix, n)
| prefix | Which scanning engine is running? | 
| n | How many combinations of arguments will be tried before failure? | 
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