willholley opened a new pull request #998: Test duplicate fields in Mango 
selector
URL: https://github.com/apache/couchdb/pull/998
 
 
   ## Overview
   
   Adds a test to verify the behaviour of duplicate fields in a Mango selector.
   
   The fix for CVE-2017-12635 (#936) resulted in CouchDB's JSON parser only 
recognising the last instance of duplicated fields in a JSON object. This 
represents a breaking change to Mango (_find)
   because, previuously, all instances would have been considered when 
evaluating a selector.
   
   This test verifies that Mango now only considers the last instance of a 
field, silently ignoring
   those that appear before it.
   
   TBD whether we can or should show an error when this occurs, since this 
leads to predicates
   silently being ignored.
   
   ## Testing recommendations
   
   Run the Mango test suite.
   
   ## Related Issues or Pull Requests
   
   #936
   
   ## Checklist
   
   - [ ] Code is written and works correctly;
   - [ ] Changes are covered by tests;
   - [ ] Documentation reflects the changes;
   

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