Is merge function behavior correct?

[tyfkda]

I am playing with RxRuby, but I'm not sure that behavior of merge function is as expected.

Here is test code:

require './lib/rx'

count_stream = RX::Observable.range(1, 5)
fizz_stream = count_stream.select {|x| x % 3 == 0}.map {'Fizz'}
otherwise_stream = count_stream.select {|x| x % 3 != 0}

merged_stream = RX::Observable.merge(fizz_stream, otherwise_stream)
merged_stream.subscribe {|x| puts x}

I think merge function of Rx keeps event order (RxMarbles ), so I expect the code outputs 1 2 Fizz 4 5, but the result is:

1
Fizz
2
4
5

Is this behavior expected?