fix: Fix printing max scale decimals

[stinodego]

I'm improving the parametric tests and finding lots of edge cases as I go along... :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.96%. Comparing base (e84fe69) to head (edb4410).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16048   +/-   ##
=======================================
  Coverage   80.96%   80.96%           
=======================================
  Files        1386     1386           
  Lines      178385   178385           
  Branches     3060     3060           
=======================================
+ Hits       144422   144430    +8     
+ Misses      33475    33466    -9     
- Partials      488      489    +1     

Flag	Coverage Δ
python	74.52% <ø> (+0.02%)	⬆️
rust	78.14% <ø> (+<0.01%)	⬆️

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