Verify Fork event order

[wvengen]

Mididings mentions the following about event order with a Fork connection:

Units are always called in the order they appear in a patch, using a “breadth-first” approach. For example, given the patch
Fork([ Port('foo'), Port('bar') ]) >> Fork([ Channel(1), Channel(2) ])
Port('foo') will be called before Port('bar'), and the two events produced by the first Fork() are then passed on to the second Fork() individually. The four events resulting from this patch are thus emitted in the order ‘foo 1’, ‘foo 2’, ‘bar 1’, ‘bar 2’.

It would be good if RMididings has the same behaviour.