Glob

Please can someone help me understand the following:
I have 4 images with a .jpg extension in a folder.
The following reads all four:
$files = glob("thumbs/{*.gif,*.jpg,}",GLOB_BRACE);

All good, however, I noticed that if the extension is in capital
letters, eg .JPG it doesn't work. Apparently this is because when
using *. in glob it's case-sensitive (I have RTFM/STFW)

So, I would expect the following to work, but it's reading each image twice!
$files = glob("thumbs/{*.gif,*.jpg,*.jpeg,*,png}",GLOB_BRACE);

What am I missing?
.

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