qualify Base.string_index_err

[stevengj]

Fixes #12.

[codecov-commenter]

Codecov Report

Merging #13 (a6853ce) into main (7c7f0b6) will decrease coverage by 1.36%.
The diff coverage is 31.25%.

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@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   75.05%   73.70%   -1.36%     
==========================================
  Files           6        6              
  Lines         417      426       +9     
==========================================
+ Hits          313      314       +1     
- Misses        104      112       +8     

Flag	Coverage Δ
unittests	73.70% <31.25%> (-1.36%)	⬇️

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Impacted Files	Coverage Δ
src/search.jl	44.15% <0.00%> (-5.12%)	⬇️
src/StringViews.jl	96.87% <66.66%> (+0.04%)	⬆️
src/decoding.jl	86.36% <100.00%> (ø)
src/regex.jl	86.76% <100.00%> (ø)

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