Allow generation of keys of different types in the same session

[Legrandin]

Fix #226

[MatthiasValvekens]

Oof, good catch. Can we have a regression test as well? :)

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.54%. Comparing base (1ff2114) to head (51bdf34).
⚠️ Report is 13 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
+ Coverage   90.17%   91.54%   +1.37%     
==========================================
  Files          15       15              
  Lines        2625     2674      +49     
  Branches       29       27       -2     
==========================================
+ Hits         2367     2448      +81     
+ Misses        255      224      -31     
+ Partials        3        2       -1     

Flag	Coverage Δ
unittests	91.54% <100.00%> (+1.37%)	⬆️

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[Legrandin]

Sure, here it is. I actually had it but forgot to add it.