Native Token Handling (Wrapping & Unwrapping)

Wrapping and unwrapping use a dedicated WETH executor, the same mechanism as any other protocol swap. The encoding library automatically inserts WETH wrap/unwrap swaps wherever an ETH/WETH bridge is needed:

• At the start: if token_in is ETH but the first swap expects WETH, a wrapping swap is prepended.

• Between swaps: if one swap outputs ETH and the next expects WETH (or vice versa), a bridging swap is inserted.

• At the end: if the last swap outputs ETH but token_out is WETH (or vice versa), an unwrapping swap is appended.

Set token_in and token_out to the actual tokens the user holds and expects to receive (native ETH or WETH), and the encoder handles the rest.

This approach supports wrapping/unwrapping at any position in the swap path (not just first and last) and works with protocols like Uniswap V4 that support native ETH swaps directly.