add a failing test for planning add_liquidity on curve.fi

[BlinkyStitt]

While trying to port this code to python, I came across what I am pretty sure is a bug planning add_liquidity for 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7.

Function signature: add_liquidity(amounts: uint256[3], min_mint_amount: uint256)

It looks like it sees uint256[3] as a dynamic type, so it cuts the first 32 bytes off. Normally that would be the length, but since this type has a known size, that is actual data.

planner.add(
  CurvePool.functions['add_liquidity(uint256[3],uint256)']([1, 2, 3], 4)
);

...

state: [
  '0x00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003',
  '0x0000000000000000000000000000000000000000000000000000000000000004'
]

I'm not sure what the right fix is.

[BlinkyStitt]

Right now, when I look at my trace, things are shifted incorrectly:

                    └── Vyper_contract.add_liquidity  [CALL]  14828:20862  [159398294 / 264948254 gas]
                        │   ├── address: 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
                        │   ├── value: 0
                        │   └── input arguments:
                        │       ├── amounts: [64, 191270331176979879371219, 97524790389]
                        │       └── min_mint_amount: 69997057133

Here, amounts should be: [28001643170146867818963, 97524790389, 69997057133]

And min_mint_amount should be: 191270331176979879371219

[decanus]

Wonder if this could relate to: weiroll/weiroll#56 there seem to be several issues with the planner and more "special" types.

[BlinkyStitt]

Yes, that does look very similar

[BlinkyStitt]

So I've changed my planner (written in Python so I can't update this repo) to treat fixed length arrays specially.

Now, for encoding, it changes a function signature like uint256[3],uint256 into uint256,uint256,uint256,uint256. This seemed easier than changing the solidity contracts.

                    ├── Vyper_contract.add_liquidity  [CALL]  16531:38302  [265426023 / 476902153 gas]
                    │   │   ├── address: 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
                    │   │   ├── value: 0
                    │   │   └── input arguments:
                    │   │       ├── amounts: [28001643170146867818963, 116657060969, 69997057133]
                    │   │       └── min_mint_amount: 209983602241401374147196