Fix "Nines" bug and add tests#3

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MitchAngenent wants to merge 6 commits intoazaitsev:masterfrom

MitchAngenent:add-tests

Commits on Jun 17, 2021

revised logic to determining millidx
Gordon Wall
committed

Commits on Jul 8, 2021

rounding fix for input numbers less than 1000
Gordon Wall
committed

Commits on Jul 9, 2021

set value of n
Gordon Wall
committed

Commits on Oct 4, 2021