Actor-based smart contracts, a much safer asynchronous model for executing smart contracts, compared with Ethereum's synchronous model. https://github.com/paritytech/substrate/pull/6202
Contract calls are evil. Many past Ethereum issues, (like theDAO callstack overflow, EIP-1884/1283 backward compatibility), are all fundamentally due to contract calls. By replacing this concept with message passing, we make contracts harder to misuse and easier to reason about.
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