Add debug-assertions and comments related to safety conditions

[CodesInChaos]

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03 ⚠️

Comparison is base (92c05bd) 86.78% compared to head (8eeb175) 86.76%.

❗ Current head 8eeb175 differs from pull request most recent head 0a5edd2. Consider uploading reports for the commit 0a5edd2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3167      +/-   ##
==========================================
- Coverage   86.78%   86.76%   -0.03%     
==========================================
  Files          84       84              
  Lines       33308    33306       -2     
==========================================
- Hits        28908    28897      -11     
- Misses       4400     4409       +9     

Impacted Files	Coverage Δ
src/context/cdf_context.rs	99.08% <100.00%> (-0.01%)	⬇️
src/dist.rs	98.98% <100.00%> (+<0.01%)	⬆️
src/lrf.rs	75.06% <100.00%> (+0.06%)	⬆️
src/util/align.rs	95.52% <100.00%> (ø)

... and 11 files with indirect coverage changes

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