Escaping of exclamation marks inside quotes seems wrong

[tmacieir]

Configuration Information [Automatically generated, do not change]:
Machine: i586
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i586' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i586-mandriva-linux-gnu' 
-DCONF_VENDOR='mandriva' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I.. -I../include -I../lib   -O2 -g -pipe 
-Wp,-D_FORTIFY_SOURCE=2 -fstack-protector --param=ssp-buffer-size=4 
-fexceptions -fomit-frame-pointer -march=i586 -mtune=generic 
-fasynchronous-unwind-tables
uname output: Linux lothlorien 2.6.23-tmb-server-0.rc7.1mdv #1 SMP Thu Sep 20 
20:43:50 EDT 2007 i686 Intel(R) Core(TM)2 CPU          6420  @ 2.13GHz GNU/Linux
Machine Type: i586-mandriva-linux-gnu

Bash Version: 3.2
Patch Level: 17
Release Status: release

Description:
        When trying to produce an exclamation mark (!) inside a quoted
        string is behaving differently from expected. I cannot see a
        way of producing an exclamation mark inside a doubly-quoted
        (") string in the bash prompt.

        Perhaps the following command sequences help explain the
        problem better:

        Behaving as expected:
$ echo !z
bash: !z: event not found
$ echo \!z
!z
$ echo "!z"
bash: !z: event not found
$ echo "\\!z"
\!z

        Not behaving as expected:
$ echo "\!z"
\!z

Repeat-By:
        See above.