If we upgrade wasm-opt to the latest version, we can use [`--signext-lowering`](https://github.com/WebAssembly/binaryen/pull/5676). This ensure the compiled contracts run on CosmWasm < 1.3. With this change, we can increase the Rust version to 1.70 and beyond.
If we upgrade wasm-opt to the latest version, we can use
--signext-lowering. This ensure the compiled contracts run on CosmWasm < 1.3.With this change, we can increase the Rust version to 1.70 and beyond.