cleanup predicate enum

[richardstartin]

Another quick cleanup of an enum I encountered recently.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.68%. Comparing base (e6330bb) to head (f04c314).
⚠️ Report is 6326 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (e6330bb) and HEAD (f04c314). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (e6330bb)	HEAD (f04c314)
unittests2	1	0
unittests1	1	0

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #8268       +/-   ##
=============================================
- Coverage     64.06%   30.68%   -33.38%     
=============================================
  Files          1586     1619       +33     
  Lines         83399    85100     +1701     
  Branches      12641    12839      +198     
=============================================
- Hits          53427    26114    -27313     
- Misses        26129    56635    +30506     
+ Partials       3843     2351     -1492     

Flag	Coverage Δ
integration1	28.91% <100.00%> (?)
integration2	27.56% <100.00%> (?)
unittests1	?
unittests2	?

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