Support boolean not !

[adrhill]

Closes #148.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.85%. Comparing base (fe43799) to head (490dbee).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #150   +/-   ##
=======================================
  Coverage   91.84%   91.85%           
=======================================
  Files          37       37           
  Lines        1484     1485    +1     
=======================================
+ Hits         1363     1364    +1     
  Misses        121      121           

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