Use NonZero*::get() instead of NonZero*.into() in some places.

[briansmith]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.59%. Comparing base (7b06be8) to head (1d11538).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/limb.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2457   +/-   ##
=======================================
  Coverage   96.59%   96.59%           
=======================================
  Files         180      180           
  Lines       21748    21748           
  Branches      538      538           
=======================================
  Hits        21007    21007           
  Misses        623      623           
  Partials      118      118           

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