Simplify parametric scalar affine function

[joaquimg]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.13%. Comparing base (275ef07) to head (4297b48).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
- Coverage   95.14%   95.13%   -0.01%     
==========================================
  Files           5        5              
  Lines        1010     1008       -2     
==========================================
- Hits          961      959       -2     
  Misses         49       49              

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