Use &Path instead of &str for index.

[ahcm]

What do you think? Will only work on Unix though.

[jguhlin]

How about AsRef?

[ahcm]

Even better.

[codecov[bot]]

Codecov Report

Merging #20 (37337aa) into main (28674ea) will decrease coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   40.26%   40.17%   -0.09%     
==========================================
  Files           3        3              
  Lines         668      667       -1     
==========================================
- Hits          269      268       -1     
  Misses        399      399              

Impacted Files	Coverage Δ
src/lib.rs	60.00% <100.00%> (-0.14%)	:arrow_down:

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