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Changelog

Changes to the reference FVM's HAMT implementation.

[Unreleased]

  • Added for_each_cacheless method to iterate over the HAMT without caching the values. This is lowers memory requirements usage and is useful for single-pass, read-only operations over large HAMTs.

0.10.4 [2025-04-09]

  • Updates multiple dependencies (semver breaking internally but not exported).

0.10.3 [2024-12-04]

  • Add a .clear() method for resetting the HAMT to empty.

0.10.2 [2024-11-20]

Empty-release intended to un-deprecate .for_each but it was never actually deprecated in this crate.

0.10.1 [2024-11-08]

Remove unnecessary features from multihash-codetable.

0.10.0 [2024-10-31]

  • Update cid to v0.11 and multihash to v0.19.
  • Update to fvm_ipld_blockstore 0.3.0 and fvm_ipld_encoding 0.5.0.
  • Switch from libipld to rust-ipld-core.

You will have to update your multihash and cid crates to be compatible, see the multihash release notes for details on the breaking changes.

0.9.0 (2023-10-25)

Breaking Changes:

  • Remove the ignore-dead-links feature.
  • Add a new StartKeyNotFound variant to the HAMT error type.

Features:

  • Implement external iteration via iter() and iter_from(start_key).

Fixes:

  • Extra-paranoid validation when reading HAMT nodes.

0.8.0 [2023-08-18)

Breaking Changes:

  • Deprecate default bitwidths in the HAMT
    • Users must now always specify the bitwidth
  • Add support for the Hamt version 0 datastructure, for historical purposes.

0.7.0 [2023-06-28)

Breaking Changes:

  • Update cid/multihash. This is a breaking change as it affects the API.
  • Add min_data_depth option to reserve the top levels of the HAMT for links, free of key-value pairs.

0.6.1 [2022-11-14]

  • FIX: HashBits::next when bit_width does not divide 256 and the full hash is consumed

0.6.0

  • Bumps fvm_ipld_encoding and switches from cs_serde_bytes to fvm_ipld_encoding::strict_bytes.

0.5.1

  • Update fvm_ipld_encoding to 0.2.0.

0.5.0

  • BREAKING: update fvm_shared to 0.5.1 for error refactor.
  • BREAKING: rename Hamt::consume to Hamt::into_store.