Faster safe_indices

[mateuszbaran]

Resolves (3) from #333 .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3d38cc5) 99.65% compared to head (96bfe4c) 99.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #334   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files          69       69           
  Lines        6337     6342    +5     
=======================================
+ Hits         6315     6320    +5     
  Misses         22       22           

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[kellertuer]

Looks good to me. We could mark this as resolved in the corresponding issue (maybe with a symbol?) – and we should collect a few more before registering a new version for sure.