#276 - Cannot deserialize from JSON Cas if child type comes before super type

[jcklie]

• Add is_predefined helper
• Use toposort to fix the bug

[codecov[bot]]

Codecov Report

Merging #277 (fa41138) into main (b173a6f) will decrease coverage by 0.04%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main     #277      +/-   ##
==========================================
- Coverage   95.39%   95.36%   -0.04%     
==========================================
  Files           5        5              
  Lines        1888     1897       +9     
==========================================
+ Hits         1801     1809       +8     
- Misses         87       88       +1     

Impacted Files	Coverage Δ
cassis/json.py	91.55% <87.50%> (-0.17%)	:arrow_down:
cassis/typesystem.py	95.45% <100.00%> (+0.02%)	:arrow_up:

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