Dear Ivan, thanks for taking the time to report this bug and help make Debian better.
I cannot reproduce the issue you describe on the current Debian stable (10/ buster), so I believe it has been fixed since you reported the bug. It would be useful if you could retest on a more recent version and confirm whether the bug is fixed for you too. Also could you please tell us which locale you’re using ? We need it if we want to try and reproduce the bug since numbers behaviours can vary quite a bit between locales. Happy hacking ! -- Aurélien