pub fn duration_iso(value: i64, unit: TimeUnit, out: &mut String)Expand description
value units as ISO 8601 text, the way Polars’ JSON writer spells a
duration (chrono’s TimeDelta display): whole seconds and the fraction’s
significant digits, P0D for zero, a leading - when negative. Computed
here rather than through chrono, whose range ends short of i64::MIN ms.