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Description
I wonder whether IndexSet::entry is in the roadmap, if yes, I can try to submit PR.
Like the one in hashbrown::HashSet, for IndexSet it will be
impl<T, S> IndexSet<T, S>
where
T: Hash + Eq,
S: BuildHasher,
{
pub fn entry(&mut self, value: T) -> Entry<'_, T, S> { ... }
}
pub enum Entry<'a,T,S> { ... }