Sourced from multidict's releases.

6.5.0

Features

• Replace internal implementation from an array of items to hash table. algorithmic complexity for lookups is switched from O(N) to O(1).

  The hash table is very similar to :class:dict from CPython but it allows keys duplication.

  The benchmark shows 25-50% boost for single lookups, x2-x3 for bulk updates, and x20 for some multidict view operations. The gain is not for free: :class:~multidict.MultiDict.add and :class:~multidict.MultiDict.extend are 25-50% slower now. We consider it as acceptable because the lookup is much more common operation that addition for the library domain.

  Related issues and pull requests on GitHub: #1128.

Contributor-facing changes

• Builds have been added for arm64 Windows wheels and the reusable-build-wheel.yml template has been modified to allow for an os value (windows-11-arm) which does not end with the -latest postfix.

  Related issues and pull requests on GitHub: #1167.

---

Sourced from multidict's changelog.

6.5.0

(2025-06-17)

Features

• Replace internal implementation from an array of items to hash table. algorithmic complexity for lookups is switched from O(N) to O(1).

  The hash table is very similar to :class:dict from CPython but it allows keys duplication.

  The benchmark shows 25-50% boost for single lookups, x2-x3 for bulk updates, and x20 for some multidict view operations. The gain is not for free: :class:~multidict.MultiDict.add and :class:~multidict.MultiDict.extend are 25-50% slower now. We consider it as acceptable because the lookup is much more common operation that addition for the library domain.

  Related issues and pull requests on GitHub: :issue:1128.

Contributor-facing changes

• Builds have been added for arm64 Windows wheels and the reusable-build-wheel.yml template has been modified to allow for an os value (windows-11-arm) which does not end with the -latest postfix.

  Related issues and pull requests on GitHub: :issue:1167.

---

• df5b5db Release 6.5.0 (#1176)
• 9d3c53f Replace pair_list with hash table (#1128)
• bdbbc48 Bump pytest-cov from 6.0.0 to 6.1.0 (#1119)
• b23c192 Bump pytest to 8.4.0 (#1169)
• 87c76b8 Fix failed spelling task (#1168)
• fa9e4b6 Add Windows arm64 builds (#1167)
• 874fc89 Increment version to 6.4.5.dev0 (#1165)
• See full diff in compare view

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