code: function doesObjectListHaveDuplicates(l) {
      const mergedList = l.reduce((merged, obj) => (
          obj ? merged.concat(Object.keys(obj)) : merged
      ), []);
  
      // Taken from: http://stackoverflow.com/a/7376645/1263876
      // By casting the array to a Set, and then checking if the size of the array
      // shrunk in the process of casting, we can check if there were any duplicates
      return new Set(mergedList).size !== mergedList.length;
  }
docs: Checks a list of objects for key duplicates and returns a boolean