filename pattern case-insensitive, but why?

[thahn01]

Hello, If I try something like:

$ touch a.c b.c A.c
$ ls [a-z]*.c
a.c  A.c  b.c

then I get A.c in the output, even if no capital letters are to be found.
Looking thru the docs I have currently:

$ shopt
autocd          off
cdable_vars     off
cdspell         off
checkhash       off
checkjobs       off
checkwinsize    on
cmdhist         on
compat31        off
compat32        off
dirspell        off
dotglob         off
execfail        off
expand_aliases  on
extdebug        off
extglob         on
extquote        on
failglob        off
force_fignore   on
globstar        off
gnu_errfmt      off
histappend      off
histreedit      off
histverify      off
hostcomplete    off
huponexit       off
interactive_comments    on
lithist         off
login_shell     off
mailwarn        off
no_empty_cmd_completion off
nocaseglob      off
nocasematch     off
nullglob        off
progcomp        on
promptvars      on
restricted_shell        off
shift_verbose   off
sourcepath      on
xpg_echo        off

Doing the same in ksh and dash works as expected.

Tnx Thomas

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