Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var desc = {
      get: function(){},
      configurable: true
    }
    
    var descMap = new Map();
    for(var p in desc){
      descMap.set(p, desc[p])
    }
  };
</script>

Test runner

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'configurable' in desc;
'enumerable' in desc;

descMap.has('configurable')
descMap.has('enumerable')

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