Fix lints in nightly CI

[HadrienG2]

Technically, one of the "fixes" is actually a workaround for a clippy false positive. But I actually like the workaround version better.

Along the way, this also fixes a trait bound bug where the "external" PartialEq impl of XML did not work because I expressed it in terms of str, when string comparison traits are actually implemented for &str.

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 2 of 2 files.

Overall, the semantic diff is 49% smaller than the GitHub diff.

	Filename	Status
✔️	src/lib.rs	77.84% smaller
✔️	src/topology/export/xml.rs	35.53% smaller

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (9ad1103) 65.28% compared to head (8bfd315) 65.28%.

Files	Patch %	Lines
src/topology/export/xml.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #105   +/-   ##
=======================================
  Coverage   65.28%   65.28%           
=======================================
  Files          43       43           
  Lines        4632     4632           
=======================================
  Hits         3024     3024           
  Misses       1608     1608           

Flag	Coverage Δ
ubuntu-latest	66.53% <0.00%> (ø)
windows-latest	63.90% <0.00%> (-0.05%)	⬇️

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