Fix ref with sibling id from 2019-09

[justin-tay]

Closes #1200

This fixes the issue with $ref.

I think it should be okay to cut a release of 2.0 after this gets merged.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.87%. Comparing base (48ca3c2) to head (84731b5).
⚠️ Report is 108 commits behind head on master.
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1203      +/-   ##
============================================
- Coverage     78.90%   77.87%   -1.04%     
+ Complexity     1965     1925      -40     
============================================
  Files           172      200      +28     
  Lines          6352     6770     +418     
  Branches       1255     1191      -64     
============================================
+ Hits           5012     5272     +260     
- Misses          867     1054     +187     
+ Partials        473      444      -29     

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[stevehu]

Great! I will start some cross-project tests and cut the tag. Thanks a lot.