[Orgmode] Prefixing a function call with C-digit

[Raffi R]

Dear org users,

I'd like to write some advice or a wrapper function for org-export
such that it defaults to a heading level of 0.

In org-mode normally, I can get this behaviour by pressing C-0 C-x
C-e.  Looking at org.el suggested that I should be able to simply
provide the 0 as an argument, i.e. using (org-export 0). However,
org-export seems to ignore that 0.

Thank you very much,
- Raffi.