dnv(9) on FreeBSD
The text 6961a559fff0, as FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE, FreeBSD 14.0-RELEASE, FreeBSD 13.5-RELEASE, FreeBSD 13.4-RELEASE, FreeBSD 13.3-RELEASE shipped it.
API for getting name/value pairs. Nonexistent pairs do not raise an error.