BQ28Z610-R1: ZVCHG Setting Matters

Part Number: BQ28Z610-R1

Set ZVCHG to 0V, and when the cell is in the range of 0V~0.9V, the charging field-effect transistor (CHG FET) is in the off state, and when it is above 1V, the CHG FET is in the on state.
1、What are the effects of low voltage and low current on cells in the 0V~0.9V range?
2、Can ZVCHG be set to 0V to achieve 0V charging prohibition?
3、Under what conditions will ZVCHG be affected when set to 0V?