Rx.Observable.timer(0, x) produces values immediately

[johnnyelwailer]

I have an Rx.Observable.timer(0, 1000), expecting it to yield a value every 1000ms. However, the values will be generated immediately.
When using Rx.Observable.timer(1000, 1000), the values will be generated as expected, after an initial delay of 1000ms.
See this Fiddle
Using Rx.all.js v4.0.0

[youngnh]

I have hit the same issue working through the examples in https://github.com/Reactive-Extensions/RxJS/blob/master/doc/gettingstarted/creating.md and found that its for any Rx.Observable.timer call with a period that doesn't match the starting delay.