ksh doesn't return the exit code of the last command within a pipe

Issue

• ksh doesn't return the exit code of the last command within a pipe
• How to reproduce

[root@localhost ~]# rpm -iv ksh-20120801-10.el6.x86_64.rpm
Preparing packages for installation...
ksh-20120801-10.el6
[root@localhost ~]# ksh
# A=`false | true`; echo $?
0
# exit
[root@localhost ~]# rpm -Fv ksh-20120801-10.el6_5.9.x86_64.rpm
Preparing packages for installation...
ksh-20120801-10.el6_5.9
[root@localhost ~]# ksh
# A=`false | true`; echo $?
1