Function gen_call_args_cfg 

pub fn gen_call_args_cfg(
    params: &[ParamDef],
    opaque_types: &AHashSet<String>,
    cast_uints_to_i32: bool,
    cast_large_ints_to_f64: bool,
) -> String

Build call argument expressions with primitive type casting for backends that remap numeric types (e.g. extendr maps f32/usize/u64 to f64 and u32 to i32).

For TypeRef::Primitive params whose binding type differs from the core type, emits name as core_ty (or .map(|v| v as core_ty) for optional params). All other params fall back to the same logic as gen_call_args.