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