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82470d4f89
This makes it so `first_child_index` will not be accessed when it is equal to `self.len`. (i.e. `self.items[self.len]` will not happen) The access itself was "safe" (as in, `self.len < self.items.len`) because we were only calling `doSiftDown` in the case where there was a stale value at `self.items[self.len]`. However, it is still technically a bug, and can manifest by an unnecessary comparison of a value to a copy of itself.