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withdrawAndUnstake Missing

2

Hi, we are currently using curve.js to add liquidity provisioning to our own frontend. We see that there is a `depositAndStake` [function](https://github.com/curvefi/curve-js/blob/1dd204e3d77a6315b39e7485c42887fa7ff4fe3e/docs/v1/README.md?plain=1#L816). However, we do not see an equivalent `unstakeAndWithdraw`...