public static IterableChecker<List<Long>, Long> check(@Nullable long[] actualLongArray) {
    return check(actualLongArray == null ? null : Longs.asList(actualLongArray));
  }
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