Can't send 0 or 1

Test case:

Python:
```python
from pythonosc import udp_client
sender = udp_client.SimpleUDPClient('127.0.0.1', 4559)
sender.send_message('/trigger/prophet', [0, 1, 2])
```

Sonic Pi:
```ruby
live_loop :foo do
  use_real_time
  a, b, c = sync "/osc/trigger/prophet"
  print(a,b,c)
end
```

Sonic Pi log:
```
{run: 9, time: 108.8493}
 └─ 2 nil nil
```