Function empty_args 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn empty_args() -> QuadArgs

Return empty additional arguments.

This is required to make the arguments part of the API, otherwise it won’t be added to the compiled package (since it does not appear in the signature of rust_quad_ker).

Safety

This is the connection from and back to Python, so we don’t know what is on the other side.