su defaults to root, not user id 0

[Nick Marden]

Hey there,

This is a somewhat frivolous bug, but my friends and I are wondering why
su defaults to user 'root' instead of to Unix user id 0. That is, if I
change the user name of the Unix account with id 0, su no longer
defaults correctly to that user name.

Any thoughts on the rationale behind this implementation decision?

Thanks,

Nick Marden
address@hidden