Test with double array fails

[magro]

While creating a test for serialization format compatibility I discovered issues with double arrays. The issue in my test is not very helpful, but I see that I cannot write a test like this (e.g. added to ArraySerializerTest):

public void testDoubleArrays () {
    kryo.register(double[].class);
    roundTrip(6, 18, new double[] {1, 2});
}

This fails with

AssertionFailedError: Incorrect number of bytes read. expected:<18> but was:<10>

But when I change it to

roundTrip(6, 10, new double[] {1, 2});

the test fails with

AssertionFailedError: Incorrect number of bytes written. expected:<10> but was:<18>

So there's a mismatch between read and write.

[magro]

So fast, awesome!