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10 年くらい前 (iOS 6 の頃) にはすでに話題になってた問題みたいです. https://stackoverflow.com/questions/16491887/uiprogressview-with-progress-at-low-values-issue (edited)
I'm running a progress bar which updates every second. It needs to run for upwards of 300 seconds so the changes in the progress bar's 'progress' variable are on the magnitude of about 0.003 per se...