ERC-7621 Basket Token

DraftERCcreated 2024-02-11requires ERC-20, ERC-165, ERC-173

A multi-asset basket token with weighted constituents and owner-managed rebalancing.

Authors: Dominic Ryder, Michael Ryder, Callum Mitchell-Clark (@AlvaraProtocol)

ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

IERC7621 0xc9c80f73

`0xa1ee8feb`	`contribute(uint256[],address,uint256)`
`0x10d79f4d`	`getConstituents()`	view
`0xc9a396e9`	`getReserve(address)`	view
`0xac6c5251`	`getWeight(address)`	view
`0x6a76d37b`	`isConstituent(address)`	view
`0xd1602deb`	`previewContribute(uint256[])`	view
`0x0a28a477`	`previewWithdraw(uint256)`	view
`0x2be01190`	`rebalance(address[],uint256[])`
`0x28b50621`	`totalBasketValue()`	view
`0x1f39b64e`	`totalConstituents()`	view
`0xb06c2075`	`withdraw(uint256,address,uint256[])`

Topic0 is the keccak256 hash of the signature, which is what a log filter matches on.

`0x65077443500d09fb9327fef77eb702295690f6c4456cb8f0923a095072b35f5a`	`Contributed(address,address,uint256,uint256[])`
`0xfad1fb5b176de5b75745458f0d7ce9a4a85b06c7c1c03516650d3fea0e96391c`	`Withdrawn(address,address,uint256,uint256[])`
`0xe3f655e86a2d47038eb04f7b87f9dea95da219cebf6126e515c1be343218293d`	`Rebalanced(address[],uint256[])`

`0xab8b67c6`	`LengthMismatch(uint256,uint256)`
`0x7c663b92`	`InvalidWeights(uint256)`
`0x1f2a2005`	`ZeroAmount()`
`0xd36931a9`	`NotConstituent(address)`
`0xcb1d8bba`	`InsufficientShares(uint256,uint256)`
`0xa3a05223`	`InsufficientAmount(uint256,uint256,uint256)`
`0xd7be0547`	`DuplicateConstituent(address)`
`0xd92e233d`	`ZeroAddress()`

Proposals this one names in its requires field.