tidy up some lifetimes

[davidhewitt]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.40%. Comparing base (d7f54f1) to head (d5ab23f).

Files	Patch %	Lines
src/de.rs	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   83.41%   83.40%   -0.02%     
==========================================
  Files           3        3              
  Lines        1224     1217       -7     
  Branches     1224     1217       -7     
==========================================
- Hits         1021     1015       -6     
+ Misses        144      143       -1     
  Partials       59       59              

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