Avoid runtime checks

[awvwgk]

Maybe better to make those compile time checks

[codecov]

Codecov Report

Merging #16 (0ad7fee) into main (cc59dd7) will increase coverage by 1.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   69.02%   70.78%   +1.76%     
==========================================
  Files           2        2              
  Lines         481      421      -60     
  Branches      261      259       -2     
==========================================
- Hits          332      298      -34     
  Misses         23       23              
+ Partials      126      100      -26     

Impacted Files	Coverage Δ
src/testdrive.F90	72.50% <0.00%> (+2.01%)	⬆️

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