Checks whether a Flake's membership constraints name at least one non-null value.
Scans the node's own any and all option sets for a value other than
null. A null option matches an absent value, so a null-only or empty set reports false. This is the
condition under which an any / all constraint implies the constrained value exists (see
isRequiredFlake). The test is local to the node.
Checks whether a Flake's membership constraints name at least one non-null value.
Scans the node's own any and all option sets for a value other than
null. Anulloption matches an absent value, so a null-only or empty set reports false. This is the condition under which anany/allconstraint implies the constrained value exists (see isRequiredFlake). The test is local to the node.