simplifying recursive references

[samuelcolvin]

Experiment, probably to be removed.

[codecov]

Codecov Report

Merging #32 (d93d878) into main (2c7c5d8) will increase coverage by 0.38%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   86.20%   86.58%   +0.38%     
==========================================
  Files          26       26              
  Lines        2080     2072       -8     
==========================================
+ Hits         1793     1794       +1     
+ Misses        287      278       -9     

Impacted Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/validators/dict.rs	69.89% <0.00%> (ø)
src/validators/function.rs	83.11% <0.00%> (ø)
src/validators/model.rs	89.14% <50.00%> (ø)
src/validators/recursive.rs	90.74% <93.33%> (+8.48%)	⬆️
src/validators/list.rs	72.36% <100.00%> (ø)
src/validators/mod.rs	98.30% <100.00%> (ø)
src/validators/model_class.rs	97.43% <100.00%> (ø)
src/validators/optional.rs	96.77% <100.00%> (+9.67%)	⬆️
src/validators/union.rs	94.73% <100.00%> (ø)
... and 1 more

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