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Separate read‑only contract access from state changes in web3.js. Use .call() for reads and .send() for writes, with explicit version notes, example code, and limitations.
Goal I need a Vyper external function to return a struct that a Solidity caller decodes with abi.decode on a live chain. Tests may pass locally when both contracts are compiled with the same Vyper version, but production uses a Solidity consumer. Constraints Vyper 0.2.x and 0.3.x encode structs in a tightly packed format that omits padding between elements.
web3js
solidity