just for the record: an explanation is given in: https://lists.gnu.org/r/bug-gnulib/2018-03/msg00000.html
patch 1/2 is: https://github.com/coreutils/gnulib/commit/4af4a4a71827c0bc5e0ec67af23edef4f15cee8e#diff-f595736fa3d73037e87e907a6ae5ec07 patch 2/2 is: https://github.com/coreutils/gnulib/commit/74d9d6a293d7462dea8f83e7fc5ac792e956a0ad#diff-f595736fa3d73037e87e907a6ae5ec07