in ERC721 (not ERC721A), they are mapping tokenId to tokenURI. like this.
// Optional mapping for token URIs
mapping (uint256 => string) private _tokenURIs;
but in ERC721A. remove _tokenURIs, and tokenURI function returns just string packed URI. also I couldn't find function of '_setTokenURI'.
I wanna know how tokenURI is used in ERC721A.