Dai versus yDai

This is the vault contract for StrategyCurveYCRV.

The dai swapped for CRV is not directly deposited into curve.finance Y pool. Why is that? Why is the dai first exchanged for yDai and only then the yDai is deposited in the Y pool?


All DAI that is in the y pool has been exchanged for yDAI.

If you deposit DAI on the curve website, they exchange it for yDAI for you.

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And which would be more gas efficient?