Ensure that adding keys to an object currently being iterated will not
   clobber active iterators pointing into that object due to a reallocation
   of the underlying hash table array.
   
   -- Testcase --
   {%
           let obj = { '0': 0, '1': 1 };
           let i = 2;
   
          for (let k, v in obj) {
                  while (i < 16) {
                          obj[i] = i;
                          i++;
                  }
          }
  
          printf("%.J\n", obj);
  %}
  -- End --
  
  -- Expect stdout --
  {
          "0": 0,
          "1": 1,
          "2": 2,
          "3": 3,
          "4": 4,
          "5": 5,
          "6": 6,
          "7": 7,
          "8": 8,
          "9": 9,
          "10": 10,
          "11": 11,
          "12": 12,
          "13": 13,
          "14": 14,
          "15": 15
  }
  -- End --

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