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fix number_of_digits bug (#2301)

* fix bug

* test larger negative

* fixup! Format Python code with psf/black push

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
D
Du Yuanchao committed
d687030d9e582534c850493ebc8a22fb4cf1ec81
Parent: aa46639
Committed by GitHub <noreply@github.com> on 8/12/2020, 4:32:35 PM