public static IterableChecker<List<Double>, Double> check(@Nullable double[] actualDoubleArray) {
    return check(actualDoubleArray == null ? null : Doubles.asList(actualDoubleArray));
  }
Convenient wrappers for matcher checking, designed for better code assist(completion) and
discoverability for most commonly used matchers.
testing/src/org/immutables/check/Checkers.java