Make imports explicit, test with ExplicitImports.jl

[adrhill]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.88%. Comparing base (116f027) to head (376e79b).

Files with missing lines	Patch %	Lines
test/runtests.jl	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
+ Coverage   90.77%   90.88%   +0.11%     
==========================================
  Files          48       48              
  Lines        2113     2106       -7     
==========================================
- Hits         1918     1914       -4     
+ Misses        195      192       -3     

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