file globbing in now case insensitive?

[Peter Silva]

After deleting a bunch of files by mistake, I've tried this on two
different ubuntu 16.04's, and it works the same, but I don't understand why.
Normally, file globbing is case sensitive. so:

blacklab% mkdir /tmp/kk
blacklab% cd /tmp/kk
blacklab% ls
blacklab% touch A b 1
blacklab% ls -al
total 1060
drwxrwxr-x  2 peter peter    4096 Apr  2 10:08 .
drwxrwxrwt 15 root  root  1081344 Apr  2 10:08 ..
-rw-rw-r--  1 peter peter       0 Apr  2 10:08 1
-rw-rw-r--  1 peter peter       0 Apr  2 10:08 A
-rw-rw-r--  1 peter peter       0 Apr  2 10:08 b
blacklab% echo [A-Z]*
A b
blacklab%

Huh?  this should only have listed A, but I got b as well...
 what's going on?

blacklab% shopt | grep -i case
nocaseglob     off
nocasematch     off
blacklab%

I can't do case sensitive file globbing any more... no matter what settings
are applied...  this is overcoming how things have worked for 30 years...
what's going on?
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