Most ERC-721 batch mints loop
_mint, paying a fresh SSTORE for every token's owner slot. On a 20-item mint that's 20 cold writes just for ownership.ERC721F takes the ERC721A-style approach: on a batch it writes the owner slot once, for the first id in the run, and leaves the rest empty. ownerOf(id) then walks backward to the nearest set slot to resolve the real owner.The trade-off is explicit: minting gets cheap, but
ownerOf and the first transfer of a token in a batch cost more (the read-time walk, plus initializing the slot on transfer). It also drops on-chain enumeration by default. Good default for large drops, wrong one if your contract reads ownership in hot paths.github.com/FrankNFT-labs/ERC721F
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