Hello guys,

I have some doubts on the rounding mode of previewXXX functions in the ERC4626 smart contract implementation.

What is the purpose of each Rouding mode on each preview function ? Why Rounding.Floor on previewDeposit and previewRedeem, why Rounding.Ceil on previewMint and previewWithdraw ? Is there any math / business model / security concerns on the roundings ?

```
/** @dev See {IERC4626-previewDeposit}. */
function previewDeposit(uint256 assets) public view virtual returns (uint256) {
return _convertToShares(assets, Math.Rounding.Floor);
}
/** @dev See {IERC4626-previewMint}. */
function previewMint(uint256 shares) public view virtual returns (uint256) {
return _convertToAssets(shares, Math.Rounding.Ceil);
}
/** @dev See {IERC4626-previewWithdraw}. */
function previewWithdraw(uint256 assets) public view virtual returns (uint256) {
return _convertToShares(assets, Math.Rounding.Ceil);
}
/** @dev See {IERC4626-previewRedeem}. */
function previewRedeem(uint256 shares) public view virtual returns (uint256) {
return _convertToAssets(shares, Math.Rounding.Floor);
}
```

Thanks a lot for the help.