Avoid using InstallValue on non-plain objects

[fingolfin]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.25%. Comparing base (cd8c5ad) to head (a77cac3).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #621      +/-   ##
==========================================
- Coverage   70.25%   70.25%   -0.01%     
==========================================
  Files         437      437              
  Lines       72404    72401       -3     
==========================================
- Hits        50867    50864       -3     
  Misses      21537    21537              

Flag	Coverage Δ
4ti2Interface	49.89% <ø> (ø)
ExamplesForHomalg	96.98% <ø> (ø)
Gauss	80.49% <ø> (ø)
GaussForHomalg	95.47% <ø> (ø)
GradedModules	79.47% <100.00%> (-0.01%)	⬇️
GradedRingForHomalg	72.74% <ø> (ø)
HomalgToCAS	72.06% <ø> (ø)
IO_ForHomalg	70.78% <ø> (ø)
LocalizeRingForHomalg	61.23% <ø> (ø)
MatricesForHomalg	69.54% <ø> (ø)
Modules	77.68% <100.00%> (-0.01%)	⬇️
RingsForHomalg	46.25% <ø> (ø)
SCO	80.27% <ø> (ø)
ToolsForHomalg	68.22% <ø> (ø)
homalg	73.57% <ø> (ø)

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