Try it the other way round (first effective, then real):
$> = $uid;
$< = $uid;
...
$ sudo strace ./switchback.pl 2>&1 | grep '^setr'
setresuid(-1, 65534, -1) = 0
setreuid(65534, 4294967295) = 0
setresuid(-1, 0, -1) = -1 EPERM (Operation not perm
+itted)
setreuid(0, 4294967295) = -1 EPERM (Operation not perm
+itted)
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