1@README.md
23- Every fake answers at once or never, and `run` polls the ask exactly once.
4 A fake that returns `Pending` and later wakes breaks that, and the test
5 panics with "fakes never leave the client pending".
6- `jitter` is 0 in the fake runtime, so delays are exact: assert durations
7 with `assert_eq!`, never a range.