Why does canonicalize call collapse after realpath?

[Martin Buchholz]

canonicalize_md.c does:

    /* First try realpath() on the entire path */
    if (realpath(original, resolved)) {
        /* That worked, so return it */
        collapse(resolved);
        return 0;
    }

And collapse promises to remove /./ and /../ BUT realpath should have
already done that:

http://pubs.opengroup.org/onlinepubs/009696899/functions/realpath.html
The *realpath*() function shall derive, from the pathname pointed to by
*file_name*, an absolute pathname that names the same file, whose
resolution does not involve '.', '..', or symbolic links.

(although it's true that collapse is not the expensive part of the
operation...)