clippy: fix warnings

[cakebaker]

This PR fixes warnings from the assert_is_empty and needless_borrows_for_generic_args lints that show up with Rust 1.99.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.27%. Comparing base (331a5c2) to head (000bc71).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #888   +/-   ##
=======================================
  Coverage   92.27%   92.27%           
=======================================
  Files          35       35           
  Lines        7576     7576           
  Branches      393      393           
=======================================
  Hits         6991     6991           
  Misses        443      443           
  Partials      142      142           

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[codspeed]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

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_{Comparing cakebaker:clippy_fix_warnings (000bc71) with main (331a5c2)}

[sylvestre]

Thanks for your PR