src/main/java/io/reactivex/Maybe.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Single<Boolean> sequenceEqual(MaybeSource<? extends T> source1, MaybeSource<? extends T> source2) {
        return sequenceEqual(source1, source2, ObjectHelper.equalsPredicate());
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <T> Single<Boolean> sequenceEqual(MaybeSource<? extends T> source1, MaybeSource<? extends T> source2) {
        return sequenceEqual(source1, source2, ObjectHelper.equalsPredicate());
    }
Returns a Single that emits a Boolean value that indicates whether two MaybeSource sequences are the
same by comparing the items emitted by each MaybeSource pairwise.
<p>
<img width="640" height="385" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sequenceEqual.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code sequenceEqual} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>

@param source1
the first MaybeSource to compare
@param source2
the second MaybeSource to compare
@param <T>
the type of items emitted by each MaybeSource
@return a Single that emits a Boolean value that indicates whether the two sequences are the same
@see <a href="http://reactivex.io/documentation/operators/sequenceequal.html">ReactiveX operators documentation: SequenceEqual</a>