And Go is already using a non-standard ABI and has to take real action to convert back to standard ABIs if you want to call external code. That's part of why cg

And Go is already using a non-standard ABI and has to take real action to convert back to standard ABIs if you want to call external code. That's part of why cgo calls are expensive, the other major bit relating to having to interact with OS threads differently than native Go code does.