Add a additional test, to make it a bit more difficult to use string comparison to pass the tests. At the moment the provided code will pass the test:
Add a additional test, to make it a bit more difficult to use string comparison to pass the tests.
At the moment the provided code will pass the test:

collection.map(function(obj){
      if(JSON.stringify(obj).includes(JSON.stringify(source).replace(/[{}]/g, ''))) arr.push(obj)
})

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