pub fn slack(medians: &[u32], spread: Spread, effect: f32, seed: u64) -> u32Expand description
The free time a day keeps for its steps taking longer than their median:
the 85th percentile of the day’s total less the sum of the medians, by a
simulation in which a shared effect moves every step of the day together
(TE16–18). effect and spread.day are today’s as known so far.