puppetlabs/puppetdb — pull request #357 by nicklewis (2012-11-20 23:56:55+00:00)
Title: Restrict "not" to only a single argument

Multiple arguments to "not" is confusing and not particularly useful. So
now "not" will only take a single argument, and will negate its value
(for v2 only, v1 remains unchanged). The old behavior can still be
achieved through `["not" ["or" ...]]`.