Normative: Adds change-array-by-copy (#2997)

Co-authored-by: Ashley Claymore <aclaymore@bloomberg.net>
Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>
Co-authored-by: Robin Ricard <rricard2@bloomberg.net>
Co-authored-by: Michael Dyck <jmdyck@ibiblio.org>
Co-authored-by: Shu-yu Guo <syg@chromium.org>
Co-authored-by: Jordan Harband <ljharb@gmail.com>
Co-authored-by: Linus Groh <mail@linusgroh.de>