The description of Position.Bias[] biasRet parameter in Views is wrong:

CompositeView
     * @param bias either <code>Position.Bias.Forward</code> or
     * <code>Position.Bias.Backward</code>
    public int viewToModel(... Position.Bias[] bias)

AsyncBoxView
     * @param biasRet an array contain the bias that was checked
    public int getNextVisualPositionFrom(...
                                         Position.Bias[] biasRet)

This parameter is used to return the bias of the returned offset into the document model.

Compare View.viewToModel:
     * @param biasReturn the returned bias