Sourced from indexmap's changelog.

2.2.3

• Added move_index and swap_indices methods to IndexedEntry, OccupiedEntry, and RawOccupiedEntryMut, functioning like the existing methods on IndexMap.
• Added shift_insert methods on VacantEntry and RawVacantEntryMut, as well as shift_insert_hashed_nocheck on the latter, to insert the new entry at a particular index.
• Added shift_insert methods on IndexMap and IndexSet to insert a new entry at a particular index, or else move an existing entry there.

2.2.2

• Added indexing methods to raw entries: RawEntryBuilder::from_hash_full, RawEntryBuilder::index_from_hash, and RawEntryMut::index.

2.2.1

• Corrected the signature of RawOccupiedEntryMut::into_key(self) -> &'a mut K, This a breaking change from 2.2.0, but that version was published for less than a day and has now been yanked.

2.2.0

• The new IndexMap::get_index_entry method finds an entry by its index for in-place manipulation.

• The Keys iterator now implements Index<usize> for quick access to the entry's key, compared to indexing the map to get the value.

• The new IndexMap::splice and IndexSet::splice methods will drain the given range as an iterator, and then replace that range with entries from an input iterator.

• The new trait RawEntryApiV1 offers opt-in access to a raw entry API for IndexMap, corresponding to the unstable API on HashSet as of Rust 1.75.

• Many IndexMap and IndexSet methods have relaxed their type constraints, e.g. removing K: Hash on methods that don't actually need to hash.

• Removal methods remove, remove_entry, and take are now deprecated in favor of their shift_ or swap_ prefixed variants, which are more explicit about their effect on the index and order of remaining items. The deprecated methods will remain to guide drop-in replacements from HashMap and HashSet toward the prefixed methods.

2.1.0

• Empty slices can now be created with map::Slice::{new, new_mut} and set::Slice::new. In addition, Slice::new, len, and is_empty are

... (truncated)

• 406bbdb Merge pull request #312 from cuviper/release-2.2.3
• 3b79b87 Release 2.2.3
• 8e6753c Merge pull request #310 from cuviper/shift_insert
• e3ff25b Merge pull request #311 from cuviper/test_debug
• 2a33977 Fully mask the "test_debug" code from normal builds
• 8c206ef Test shift_insert that moves
• 5debe73 IndexSet::swap_indices is O(1) too
• 4572493 Add IndexSet::shift_insert based on map's method
• 3b217ca Add IndexMap::shift_insert based on Entry
• 209e3e1 Document equivalence of move_index/swap_indices
• Additional commits viewable in compare view

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