function initialize(AuctionCrowdfundOptions memory opts)
        external
        payable
        onlyConstructor
    {
...
maximumBid = opts.maximumBid;
...
}
function bid() external onlyDelegateCall {
...
}
if (market.getCurrentHighestBidder(auctionId_) == address(this)) {
            revert AlreadyHighestBidderError();
        }
        // Get the minimum necessary bid to be the highest bidder.
        uint96 bidAmount = market.getMinimumBid(auctionId_).safeCastUint256ToUint96();
        // Make sure the bid is less than the maximum bid.
        if (bidAmount > maximumBid) {
            revert ExceedsMaximumBidError(bidAmount, maximumBid);
        }
        lastBid = bidAmount;
