Sourced from multidict's releases.

6.6.4

Bug fixes

• Fixed MutliDict & CIMultiDict memory leak when deleting values or clearing them -- by :user:Vizonex

  Related issues and pull requests on GitHub: #1233.

Contributor-facing changes

• The type preciseness coverage report generated by MyPy <https://mypy-lang.org>__ is now uploaded to Coveralls <https://coveralls.io/github/aio-libs/multidict>__ and will not be included in the Codecov views <https://app.codecov.io/gh/aio-libs/multidict>__ going forward -- by :user:webknjaz.

  Related issues and pull requests on GitHub: #1122, #1231.

• Added memory leak test for popping or deleting attributes from a multidict to prevent future issues or bogus claims. -- by :user:Vizonex

  Related issues and pull requests on GitHub: #1233.

---

6.6.3

Bug fixes

• Fixed inconsistencies generated by the C implementation of _md_shrink() which might later lead to assertion failures and crash -- by :user:Romain-Geissler-1A.

  Related issues and pull requests on GitHub: #1229.

---

6.6.2

Bug fixes

• Fixed a memory corruption issue in the C implementation of _md_shrink() that could lead to segmentation faults and data loss when items were deleted from a :class:~multidict.MultiDict. The issue was an edge case in the pointer arithmetic during the compaction phase -- by :user:bdraco.

... (truncated)

Sourced from multidict's changelog.

6.6.4

(2025-08-11)

Bug fixes

• Fixed MutliDict & CIMultiDict memory leak when deleting values or clearing them -- by :user:Vizonex

  Related issues and pull requests on GitHub: :issue:1233.

Contributor-facing changes

• The type preciseness coverage report generated by MyPy <https://mypy-lang.org>__ is now uploaded to Coveralls <https://coveralls.io/github/aio-libs/multidict>__ and will not be included in the Codecov views <https://app.codecov.io/gh/aio-libs/multidict>__ going forward -- by :user:webknjaz.

  Related issues and pull requests on GitHub: :issue:1122, :issue:1231.

• Added memory leak test for popping or deleting attributes from a multidict to prevent future issues or bogus claims. -- by :user:Vizonex

  Related issues and pull requests on GitHub: :issue:1233.

---

6.6.3

(2025-06-30)

Bug fixes

• Fixed inconsistencies generated by the C implementation of _md_shrink() which might later lead to assertion failures and crash -- by :user:Romain-Geissler-1A.

... (truncated)

• e0e61c2 Release 6.6.4 (#1234)
• 820631f Fix Memory leaks and add tests to prevent memory leaks during md_clear from p...
• 00e3803 Merge branch 'maintenance/1122-coveralls-mypy'
• 736f179 📝 Add a change note for PR #1231
• 19f085e 🩹 Drop MyPy 3.9 ref from the linters workflow
• 97ce0ed Move reporting MyPy type preciseness to Coveralls
• dbd686f Bump to 6.6.3 (#1230)
• ac62105 Fixed inconsistencies generated by _md_shrink. (#1229)
• 8ea6942 Release 6.6.2 (#1224)
• 149c693 Fix format strings on 32bit platforms (#1226)
• Additional commits viewable in compare view

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