Checks whether a Flake's membership constraints include an explicit null option.
Scans the node's own any and all option sets for a null entry,
which matches an absent value and so relaxes the constraint from an existence requirement. The test is
local to the node.
Checks whether a Flake's membership constraints include an explicit
nulloption.Scans the node's own any and all option sets for a
nullentry, which matches an absent value and so relaxes the constraint from an existence requirement. The test is local to the node.