Squashed 'nz-util/' content from commit bd4cdb1

git-subtree-dir: nz-util
git-subtree-split: bd4cdb1397210e623773ac5e75c0f8b3a9ab8c8d
Merge commit '2d6fd780f12b735007406efcb770081cdeca327b' as 'nz-util'