> Rust (LLVM) pragmatically call[s] CommandLineToArgv

This is not correct. It calls `GetCommandLine` to get the raw command line string and then attempts to parse it in the same way as modern C/C++. https://github.com/rust-lang/rust/blob/3b186511f62b0ce20e72e...

The rules themselves are officially documented here: https://docs.microsoft.com/en-us/cpp/cpp/main-function-comma...

Though the linked David Deley investigation is more in-depth: https://daviddeley.com/autohotkey/parameters/parameters.htm#...