constant: ensure float value & improve printing of constants

[FabianHofmann]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d43b533) 89.15% compared to head (b6fc7eb) 89.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #194      +/-   ##
==========================================
+ Coverage   89.15%   89.17%   +0.01%     
==========================================
  Files          15       15              
  Lines        3291     3297       +6     
  Branches      753      756       +3     
==========================================
+ Hits         2934     2940       +6     
  Misses        248      248              
  Partials      109      109              

Files	Coverage Δ
linopy/common.py	91.66% <100.00%> (+0.41%)	⬆️
linopy/expressions.py	89.74% <100.00%> (+0.03%)	⬆️
linopy/objective.py	93.68% <100.00%> (ø)
linopy/solvers.py	89.11% <83.33%> (-0.12%)	⬇️

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