Normalize preprocessing point inputs

[svchb]

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[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.90%. Comparing base (d205497) to head (217ca63).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/preprocessing/preprocessing.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1188      +/-   ##
==========================================
+ Coverage   89.05%   89.90%   +0.85%     
==========================================
  Files         128      134       +6     
  Lines       10039    10461     +422     
==========================================
+ Hits         8940     9405     +465     
+ Misses       1099     1056      -43     

Flag	Coverage Δ
total	89.90% <90.00%> (+0.85%)	⬆️
unit	70.52% <90.00%> (+2.41%)	⬆️

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