LSPS5 - small follow ups

[martinsaposnic]

Addressing comments from @tnull #3662 (comment), #3662 (comment), #3662 (comment)

[ldk-reviews-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.95%. Comparing base (ff279d6) to head (79f1da5).
⚠️ Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3963      +/-   ##
==========================================
+ Coverage   88.91%   88.95%   +0.03%     
==========================================
  Files         173      173              
  Lines      123393   123794     +401     
  Branches   123393   123794     +401     
==========================================
+ Hits       109717   110120     +403     
- Misses      11216    11224       +8     
+ Partials     2460     2450      -10     

Flag	Coverage Δ
fuzzing	22.21% <0.00%> (-0.11%)	⬇️
tests	88.78% <100.00%> (+0.03%)	⬆️

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[tnull]

Post-merge ACK