/// `NoneOneOrMany` enum.
/// `OneOrMany` enum.
/// Serde adapter that writes an `IndexMap` as a sequence of `(key, value)` pairs, for maps with
/// non-string keys.
/// `Snapshot<T>` new type wrapper.
pub type FnvIndexMap<K, V> = IndexMap;
pub type FnvIndexSet<T> = IndexSet;