Constraint for checking if a SS_List contains only items matching the given key-value pairs. Each match must correspond to 1 distinct record.
evaluate(SS_List $other, string $description = '', bool $returnResult = false)
Evaluates the constraint for parameter $other
If $returnResult is set to false (the default), an exception is thrown in case of a failure. null is returned otherwise.
If $returnResult is true, the result of the evaluation is returned as a boolean value instead: true in case of success, false in case of a failure.