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This is a part of #128 for the special case of Dai. This token isn't fully EIP-2612 compatible, but it's used in upstream.
This PR adds a basic implementation of Dai, which is just an ERC-20 with
permit
. The real Dai contract doesn't compile with modern versions of Solidity and there are no yarn packages with it already precompiled. We also need its API, which is available as a package, but it too needs old Solidity to work. An alternative would be to pull the Dai source code, compile it to a JSON and keep a copy of it in our repo. I think that with such simple contract it's clearer to maintain these few lines of code instead of a binary blob.