I'm confused about status of running setuid script with perl 5.16

I see in 5.12 delta
suidperl is no longer part of Perl. It used to provide a mechanism to emulate setuid permission bits on systems that don't support it properly.

I read this as systems that properly support setuid bits should not be affected, but my experience does not match.

Summary
-------
God awful old RedHat 8.0 perl 5.8.8 setting setuid on script works as expected. New Centos 7 perl 5.16 setting setuid on script does not work as expected.

example
-------
On Centos 7 Perl 5.16

sudo -i
cat > /tmp/setuid.pl
#!/usr/bin/perl
use English;
print "UID:$UID EUID:$EUID\n";
ctrl D

chmod a+rx /tmp/setuid.pl
chmod u+s /tmp/setuid.pl 
exit
/tmp/setuid.pl
UID:1334 EUID:1334

[download]

On RedHat 8.0 perl 5.8.8

sudo -s
cat > /tmp/setuid.pl
#!/usr/bin/perl
use English;
print "UID:$UID EUID:$EUID\n";
ctrl D

chmod a+rx /tmp/setuid.pl
chmod u+s /tmp/setuid.pl 
exit
/tmp/setuid.pl
UID:1334 EUID:0

[download]

Have I overlooked something on Centos 7 setup to allow setuid?
Or did all setuid functionality get killed in 5.12?

In reply to perl 5.16 setuid by jamesrleu

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