vyper-smart-contracts
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ERC721 onERC721Received returns(bytes4)
function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes _data) external returns(bytes4);
contract ERC721TokenReceiver:
-> _data: bytes[256]
change to ?:
-> _data: bytes[4]
or change to ?:
-> _data: bytes32