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if( this._items.length === 0 || (this._items.length === MAX_HISTORY && block.number > this.worstBlockNumber()) || (this._items.length < MAX_HISTORY && block.number < this.bestBlockNumber() && addingHistory) ) |
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if( this._items.length === 0 || (this._items.length > 0 && block.number > this.worstBlockNumber()) || (this._items.length < MAX_HISTORY && block.number < this.bestBlockNumber() && addingHistory) ) |