min/max not updating correctly after mod about datalib HOT 3 CLOSED

var dl = require('./src/index'),
    assert = require('assert');

var add = 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var mod = 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dexed_price":0.2549865857926047},{"_id":13432,"symbol":"AAPL","indexed_price":0.08095182549865855},{"_id":13433,"symbol":"AAPL","indexed_price":-0.004432520704537614},{"_id":13434,"symbol":"AAPL","indexed_price":0.05132392394727623},{"_id":13435,"symbol":"AAPL","indexed_price":0.041759010848011174},{"_id":13436,"symbol":"AAPL","indexed_price":0.22617520121311094},{"_id":13437,"symbol":"AAPL","indexed_price":0.4677475796104047},{"_id":13438,"symbol":"AAPL","indexed_price":0.5841595707453633},{"_id":13439,"symbol":"AAPL","indexed_price":0.6613787472296746},{"_id":13440,"symbol":"AAPL","indexed_price":0.905867257669427},{"_id":13441,"symbol":"AAPL","indexed_price":0.9620902834480345},{"_id":13442,"symbol":"AAPL","indexed_price":1.1620202962790154},{"_id":13443,"symbol":"AAPL","indexed_price":1.1987635600139974},{"_id":13444,"symbol":"AAPL","indexed_price":1.3318558264318208},{"_id":13445,"symbol":"AAPL","indexed_price":1.458066021229441},{"_id":13446,"symbol":"AAPL","indexed_price":1.2402892802986119},{"_id":13447,"symbol":"AAPL","indexed_price":1.3867957541117462},{"_id":13448,"symbol":"AAPL","indexed_price":1.60142307243672}];

// Checking data
assert.equal(add.length, mod.length);
for(var i=0, len=add.length; i<len; ++i) {
  assert.equal(add[i]._id, mod[i]._id);
  assert.notEqual(add[i].indexed_price, mod[i].indexed_price);
}

var agg = dl.groupby()
  .stream(true)
  .key("_id")
  .summarize([{
    name: "value",
    get: dl.$('indexed_price'),
    ops: ["min", "max"],
    as:  ["min", "max"]
  }]);

for(i=0, len=add.length; i<len; ++i) { agg._add(add[i]); }

console.log(agg.result()[0]); // { min: -0.8618695048588617, max: 4.800260078023406 }
console.log(dl.min(add, dl.$('indexed_price')), dl.max(add, dl.$('indexed_price'))); // Correct

function aggmod(i) {
  var t = mod[i],
      a = add[i],
      p = {_id: a._id, symbol: a.symbol, indexed_price: a.indexed_price};
  a.symbol = t.symbol; a.indexed_price = t.indexed_price;
  agg._mod(a, p); 
}

for(i=0, len=mod.length; i<len; ++i) {
  aggmod(i);
  agg.result();
}

console.log(agg.result()[0]); // Incorrect: { min: -0.9175317858392628, max: 1.60142307243672 }
console.log(dl.min(mod, dl.$('indexed_price')), dl.max(mod, dl.$('indexed_price'))); // Correct: -0.9175317858392628 2.6079108043535966