Allow traversals as predicates

[polytypic]

See #158

[codecov-io]

Codecov Report

Merging #184 into master will decrease coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
- Coverage   99.83%   99.59%   -0.24%     
==========================================
  Files           1        1              
  Lines        1227     1242      +15     
==========================================
+ Hits         1225     1237      +12     
- Misses          2        5       +3

Impacted Files	Coverage Δ
dist/partial.lenses.cjs.js	99.59% <0%> (-0.24%)	⬇️

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