> SunOS 4.1.x exhibits this behavior, for both root and regular users.

As root:

	penguin-lust# uname -a
	SunOS penguin-l 4.1.3_U1 32 sun4m
	penguin-lust# chmod u+x,u+s foo
	penguin-lust# ls -l foo
	-rwsr--r--  1 root            0 Dec 10 11:30 foo
	penguin-lust# chown ghudson foo
	penguin-lust# ls -l foo
	-rwsr--r--  1 ghudson         0 Dec 10 11:30 foo
	penguin-lust# rm foo

I'm getting a serious disconnect between what people are claiming as
facts in this discussion and what I actually experience in testing.
The root/non-root confusion explains some of it, but not this one.
Bothersome.