about Tick._openNodes

[jcmiao]

When I define parallel nodes, tick._openNodes and lastOpenNodes have some problems
(my english is poor)

var start = 0;
var i;
for (i = 0; i < Math.min(lastOpenNodes.length, currOpenNodes.length); i++) {
  start = i + 1;
  if (lastOpenNodes[i] !== currOpenNodes[i]) {
    break;
  }
}

There are problems with this comparison

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[jcmiao]

i use a map to save current opennodes as bellow:
for i, v := range lastOpenNodes {
if !map.find(key(v)) {
v._close(tick)
}
}

[jcmiao]

It's going to make the node that I opened this time will be closed.
Perhaps because of the parallel node I joined, the tree has multiple running branches, which makes the last time and current opennodes compare