cron 0.16.0

A cron expression parser and schedule explorer.
Documentation 
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use std::collections::BTreeSet;

pub type Ordinal = u32;
// TODO: Make OrdinalSet an enum.
// It should either be a BTreeSet of ordinals or an `All` option to save space.
// `All` can iterate from inclusive_min to inclusive_max and answer membership
// queries
pub type OrdinalSet = BTreeSet<Ordinal>;