`nl` invocation soaking all input before numbering

How can this be done?

I don't see any applicable option in the manual.

I have positively checked that indentation breaks after ten million lines.

You can check it like:

$ (for i in `seq 0 10000000`; do echo "$i"; done) | nl

I don't often generate so many lines, but I don't want it to break like it does. How can this be done?