I’m following the LaTeX3 bug tracker, and saw the issue about `\lua_now:x` being renamed to `\lua_now_x:n`. I suspect the explanation will be over my head, but since I haven't seen this discussed on this list or explained in the l3 docs I figure someone's got to ask: What's the difference between the `:x` signature and the `_x:n` suffix+signature? —Joel