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Seeing the first mention of 10 seconds, I thought (jokingly) - Why not grep the source for the 10 second value.

Jokingly, because I thought it would be an emergent property, not a literal value.

Turns out it was a literal value after all and grepping would have helped!

There was no mention of a ten second interval anywhere in the code, only in the tests they wrote while debugging.

As mentioned in the article, there is a 10 second value in Tokio - the default thread timeout.

That wouldn’t be greppable in the source though?