fix constraint checking the wrong bound to skip calculation

[till-m]

fix #546

this should bring slight performance improvements

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.04%. Comparing base (a4103ff) to head (22ff2de).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #555   +/-   ##
=======================================
  Coverage   96.04%   96.04%           
=======================================
  Files          12       12           
  Lines        1139     1139           
=======================================
  Hits         1094     1094           
  Misses         45       45           

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