Replace single element vector constants with float constants

[devmotion]

Split from #514. Addresses #514 (comment).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.17%. Comparing base (f534b8c) to head (48d8582).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #516   +/-   ##
=======================================
  Coverage   94.17%   94.17%           
=======================================
  Files          14       14           
  Lines        2969     2969           
=======================================
  Hits         2796     2796           
  Misses        173      173           

Flag	Coverage Δ
unittests	94.17% <100.00%> (ø)

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