function _depositRawEthIntoLido(uint256 _initialETH) internal returns (uint256) {
    // check before-after balances for 1-wei corner case
    uint256 _balBefore = stEth.balanceOf(address(this));
    // TODO call submit() with a referral?
    payable(address(stEth)).call{value: _initialETH}("");
    uint256 _deposit = stEth.balanceOf(address(this)) - _balBefore;
    return _deposit;
}
function _depositRawEthIntoLido(uint256 _initialETH) internal returns (uint256) {
    // check before-after balances for 1-wei corner case
    uint256 _balBefore = stEth.balanceOf(address(this));
-   // TODO call submit() with a referral?
-   payable(address(stEth)).call{value: _initialETH}("");
+   IstETH(address(stEth)).submit{value: _initialETH}(owner());
    uint256 _deposit = stEth.balanceOf(address(this)) - _balBefore;
    return _deposit;
}
