Improving walletOfOwner efficiency

[liarco]

From the ERC721A implementation:

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return _startTokenId() <= tokenId && tokenId < _currentIndex && !_ownerships[tokenId].burned;
    }

In our case _startTokenId() <= tokenId && tokenId < _currentIndex are implicitly true when we get to the following line:

nft-erc721-collection/smart-contract/contracts/YourNftToken.sol

Line 83 in 5886b1e

if (_exists(currentTokenId)) {

This means that the function can be replaced by !_ownerships[tokenId].burned only.