add initialJitter feature

[daern91]

I accidentally closed #57, opening a new one :-)

We ran into a case where we need to use an initialJitter to randomize a delay for the first call attempt too.

PR adds this.

• Test
• Code
• Docs

[mdlavin]

@daern91 thanks for the new signed commit. It looks like one of the tests failed

[daern91]

@daern91 thanks for the new signed commit. It looks like one of the tests failed

Wow, what a nice catch in CI. Thanks for the heads up @mdlavin!

It took me a couple of attempts to reproduce this error. My theory is that it was because we fired off the setTimeout without awaiting it. It could be that this caused problems for the event loop when we ran a lot of retries at the same time, as in the test setup.

After updating the sleep function in this commit: c1a7cd0

I was no longer able to reproduce it.

edit: I also updated the tests to remove the check for larger than 0 jitter. It didn't make sense since technically we can get a 0 jitter time and it's also not included in the other jitter tests. ref.

Now the PR should be good to merge.