Stream.cumulate issue

[Georgiy Rakov]

Hello,

cumulate().toArray() seems not to work properly with nulls. Consider 
following code:

    import java.util.Arrays;
    import java.util.stream.Stream;

    public class CumulateIssue {
         public static void main(String [] argv) {
             Stream<Object> stream = Arrays.parallel(new Object[]{null,
    null, null, null}).cumulate((a, b)->3);
             System.out.println(Arrays.toString(stream.toArray()));
         }
    }


It obviously should output:

    [null, 3, 3, 3]

But instead it outputs:

    [null, null, null, null]

I could suppose it's a bug. Please confirm if it is.

I use nightly build of November 5.

The code is attached for your convenience.

Thanks,
Georgiy.
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