Arithmetic expansion peculiarity

[Joe Lightning]

Configuration Information [Automatically generated, do not change]:
        Machine: i686
        OS: linux-gnu
        Compiler: gcc
        Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -march=i686
-mtune=generic -O2 -pipe
-DDEFAULT_PATH_VALUE='/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin'
 -DSTANDARD_UTILS_PATH='/usr/bin:/bin:/usr/sbin:/sbin' 
-DSYS_BASHRC='/etc/bash.bashrc' -DSYS_BASH_LOGOUT='/etc/bash.bash_logout'
        uname output: Linux joelightning.com 2.6.36-ARCH #1 SMP PREEMPT
Sun Dec 12 08:44:00 UTC 2010 i686 Intel(R) Celeron(TM) CPU 1100MHz
GenuineIntel GNU/Linux
        Machine Type: i686-pc-linux-gnu
        
        Bash Version: 4.1
        Patch Level: 9
        Release Status: release
        
        Description:
                Bash doesn't like leading zeros in arithmetic expansion.
        
        Repeat-By:
                echo $(( 09 - 1 ))

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