7702: Failed to decode transaction

[chris13524]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Viem Version

2.21.6

Current Behavior

When using the 7702 example here anvil (ran with anvil --hardfork=prague) returns the error "Failed to decode transaction"

Expected Behavior

The example works

Steps To Reproduce

Run the linked example against anvil --hardfork=prague

Link to Minimal Reproducible Example

https://github.com/chris13524/viem/blob/failed-to-decode-transaction/examples/7702/index.ts

Anything else?

Upon debugging myself it appears to be an RLP encoding issue: leading zero. The error is that the nonce is encoded as a zero when it should be an empty array. When using anvil_setNonce to bump the nonce to 1 then the decoding error disappears.

https://ethereum.org/en/developers/docs/data-structures-and-encoding/rlp/

https://github.com/recmo/uint/blob/293d2962a3a5e54ff1cc583d4165003695e89bb5/src/support/alloy_rlp.rs#L81

[github-actions]

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