Sourced from indexmap's changelog.

2.2.6

• Added trait MutableValues for opt-in mutable access to set values.

2.2.5

• Added optional borsh serialization support.

2.2.4

• Added an insert_sorted method on IndexMap, IndexSet, and VacantEntry.
• Avoid hashing for lookups in single-entry maps.
• Limit preallocated memory in serde deserializers.

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.

... (truncated)

• 3f0fffb Merge pull request #323 from cuviper/mutable
• 33c1a7c Fix unused_imports
• b76ff73 Fix clippy::multiple_bound_locations
• 0060546 Release 2.2.6
• 210b027 Opt-in mutable access on IndexSet
• 184fe4b Merge pull request #320 from cuviper/release-2.2.5
• 5d7bd5e Release 2.2.5
• c934ace Merge pull request #313 from heliaxdev/heliax/borsh-support
• b81a4d2 Use S for the BuildHasher parameter
• 32793f1 Don't require BuildHasher in BorshSerialize
• Additional commits viewable in compare view

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