Remove unreachable remainder conversion fallbacks

[terror]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.29%. Comparing base (b956815) to head (334996d).

Files with missing lines	Patch %	Lines
src/number.rs	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   82.97%   83.29%   +0.31%     
==========================================
  Files          70       70              
  Lines        3672     3657      -15     
==========================================
- Hits         3047     3046       -1     
+ Misses        625      611      -14     

Flag	Coverage Δ
unit	83.29% <91.66%> (+0.31%)	⬆️

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