Observable.timer fires immediately for very large values

[GregRos]

RxJS version:
5.5.6
Code to reproduce:

Observable.timer(10 ** 20);
//or:
Observable.timer(Infinity);

Expected behavior:
An observable that will fire after an incredibly long amount of time or never.

Alternatively, (less desireable), throwing an Error indicating the time is out of range.

Actual behavior:
An observable that emits immediately.

Additional information:

[kwonoj]

dupe of #3015 .

[lock]

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