Checks whether a Flake's set matching constraints include an explicit null option.
Inspects the node's own any and all option sets for a null entry.
A null option matches an absent value, so the constraint no longer requires the value to exist. The test is
local to the node.
Checks whether a Flake's set matching constraints include an explicit
nulloption.Inspects the node's own any and all option sets for a
nullentry. Anulloption matches an absent value, so the constraint no longer requires the value to exist. The test is local to the node.