typeset does not make variable local in function

[Clay Harris]

Problem:

typeset, when used in a function should always mark the variable as local.
When bash is in ksh mode, it fails to do this.
Previous versions did not have this problem, e.g.
GNU bash, version 3.00.15(1)-release (i386-redhat-linux-gnu)

Recent versions of ksh seem to be exhibiting the same bug.


System:

Linux XXX 2.6.20-1.2948.fc6 #1 SMP Fri Apr 27 19:48:40 EDT 2007 i686 i686 i386 
GNU/Linux
GNU bash, version 3.1.17(1)-release-(i686-redhat-linux-gnu)
Login shell = /bin/bash

Reproduction:

----------------------------------------------------------------
x1:

#!/bin/bash

F1 () {
        typeset T1

        T1="Wrong!"
}

echo "Before=$T1"
F1
echo "After=$T1"
----------------------------------------------------------------

----------------------------------------------------------------
x2:

#!/bin/ksh

F1 () {
        typeset T1

        T1="Wrong!"
}

echo "Before=$T1"
F1
echo "After=$T1"
----------------------------------------------------------------

/bin/bash
./x1
Before=
After=
exit

/bin/bash
./x2
Before=
After=Wrong!
exit

/bin/bash -c ". ./x1"
Before=
After=

/bin/bash -c ". ./x2"
Before=
After=

/bin/ksh -c ". ./x1"
Before=
After=Wrong!

/bin/ksh -c ". ./x2"
Before=
After=Wrong!