async-priority-limiter 0.4.4

Throttles prioritised tasks by limiting the max concurrent tasks and minimum time between tasks, with up to two levels based on keys
Documentation 
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use std::hash::Hash;

pub trait TaskResult: Send + 'static {}
impl<T: Send + 'static> TaskResult for T {}

pub trait Priority: Ord + Send + Clone + 'static {}
impl<P: Ord + Send + Clone + 'static> Priority for P {}

pub trait Key: Clone + Hash + PartialEq + Eq + Send + Sync + 'static {}
impl<K: Clone + Hash + PartialEq + Eq + Send + Sync + 'static> Key for K {}