22.0

What's Changed

• Fix compatible version specifier incorrectly strip trailing '0' by @kasium in #493
• Remove support for Python 3.6 by @abravalheri in #500
• Use concurrency limit in ci by @blink1073 in #510
• Fix issue link in changelog. by @bdice in #509
• chore: test with PyPy 3.8 & 3.9 by @mayeut in #512
• Accept locally installed prereleases by @q0w in #515
• Always run GHA workflows when they change by @mayeut in #516
• Add __hash__/__eq__ to requirements by @abravalheri in #499
• Upgrade to setup-python v3 and use caching for GHA by @brettcannon in #521
• allow pre-release versions in marker evaluation by @graingert in #523
• Error out from workflow on missing interpreter by @mayeut in #525
• chore: update pre-commit config to the latest repos' versions by @mayeut in #534
• chore: remove Windows PyPy 3.9 workaround on GHA by @mayeut in #533
• Use pipx to run nox / build in GHA workflows by @mayeut in #517
• Run tests with all PyPy versions locally by @mayeut in #535
• Adhere to PEP 685 when evaluating markers with extras by @hroncok in #545
• chore: update mypy and move to toml by @henryiii in #547
• Normalize extra comparison in markers for output by @brettcannon in #549
• Evaluate markers under environment with empty "extra" by @MrMino in #550
• Do not set extra in default_environment() by @sbidoul in #554
• Update extlinks strings to use a format string by @mayeut in #555
• Update CI test workflow to use setup-python@v4 by @mayeut in #556
• CI: Update actions/* to their latest major versions by @mayeut in #557
• Fix a spelling mistake by @venthur in #558
• fix: macOS platform tags with old macOS SDK by @mayeut in #513
• Correctly parse ELF for musllinux on Big Endian by @uranusjr in #538
• A metadata module with a data class for core metadata by @brettcannon in #518
• Document utils.NormalizedName by @brettcannon in #565
• Drop LegacySpecifier and LegacyVersion by @pradyunsg in #407
• Move metadata, versions and specifiers API documentation to sphinx.ext.autodoc by @pradyunsg in #572
• Demonstrate behaviour of SpecifierSet.__iter__ by @hauntsaninja in #575
• Handwritten parser for parsing requirements by @hrnciar in #484
• Add changelog entry for removal of pyparsing dependency by @hroncok in #581
• Use Iterator instead of Iterable for specifier filter methods by @ichard26 in #584
• Better output on linter failure by @henryiii in #478
• Add a "cpNNN-none-any" tag by @joonis in #541
• Document exceptions raised by functions in utils by @MrMino in #544
• Refactor ELF parsing logic to standlone class by @uranusjr in #553
• Forbid prefix version matching on pre-release/post-release segments by @mayeut in #563
• Update coverage to >=5.0.0 by @mayeut in #586
• Normalize specifier version for prefix matching by @mayeut in #561
• Add python 3.11 by @mayeut in #587
• Fix prefix version matching by @mayeut in #564
• Remove duplicate namedtuple by @layday in #589
• Update changelog by @pradyunsg in #595
• Change email-related fields in Metadata to str by @brettcannon in #596
• Add versionchanged for 21.3 by @brettcannon in #599
• refactor: use flit as a backend by @henryiii in #546
• Remove packaging.metadata by @pradyunsg in #603
• Refactor nox requirements to use requirements files (#601) by @strokirk in #609
• Improve Requirement/Marker parser with context-sensitive tokenisation by @pradyunsg in #624

New Contributors

• @kasium made their first contribution in #493
• @abravalheri made their first contribution in #500
• @blink1073 made their first contribution in #510
• @bdice made their first contribution in #509
• @q0w made their first contribution in #515
• @graingert made their first contribution in #523
• @hrnciar made their first contribution in #484
• @ichard26 made their first contribution in #584
• @joonis made their first contribution in #541
• @strokirk made their first contribution in #609

Full Changelog: 21.3...22.0