Dir.glob case insensitive

Let’s say you have two files: 1.jpg and 2.JPG

~/dir ❯❯❯ ls -al
-rw-r--r--  1 stjhimy  staff     0B Sep 13 10:00 1.jpg
-rw-r--r--  1 stjhimy  staff     0B Sep 13 10:00 2.JPG

Dir.glob('./*.jpg')
 => ["./1.jpg"]

File::FNM_CASEFOLD makes it case insensitive:

Dir.glob('./*.jpg', File::FNM_CASEFOLD)
 => ["./1.jpg", "./2.JPG"]