bug#35587: sort order wrt lower/upper case

[Toralf Förster]

I'd expect "B" being the first line here:

        echo a B c d | xargs -n 1 | sort

using sys-apps/coreutils-8.30 at a stable hardened Gentoo Linux, but it is "a". 
Is this a bug or a feature?
(origin use case was "lsmod | sort" where now the head line of lsmod isn't any 
longer the first line of the output.

--
Toralf
PGP C4EACDDE 0076E94E