Prevent invalidations of safe logging functionality by custom loggers.

[maleadt]

Fixes #431

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (7c4855e) 87.13% compared to head (9a2f103) 87.14%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #432   +/-   ##
=======================================
  Coverage   87.13%   87.14%           
=======================================
  Files          24       24           
  Lines        2939     2941    +2     
=======================================
+ Hits         2561     2563    +2     
  Misses        378      378           

Impacted Files	Coverage Δ
src/utils.jl	97.95% <100.00%> (+0.08%)	⬆️

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