src/chown-core.c will replace setuid bits after the syscall has
stripped them. It is prefaced with a comment:
/* The change succeeded. On some systems, the chown function
resets the `special' permission bits. When run by a
`privileged' user, this program must ensure that at least
the set-uid and set-group ones are still set. */
This can lead to some unpleasant race conditions. Please consider
implementing an option to disable the chmod() which does this.
Ideally it would be chown's default behavior.
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