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~~~~~~~~~~~~~~~~~

* Add support for the deprecated, PEP 345 environment markers in addition to
the newer markers.

~~~~~~~~~~~~~~~~~

* Fix a regression in parsing requirements with whitespaces between the comma
separators.

~~~~~~~~~~~~~~~~~

* Fix a regression in parsing requirements like ``foo (==4)``.

~~~~~~~~~~~~~~~~~

* Fix a bug where ``packaging.requirements:Requirement`` was overly strict when
matching legacy requirements.

~~~~~~~~~~~~~~~~~

* Add a function that implements the name canonicalization from PEP 503.

~~~~~~~~~~~~~~~~~

* Implement requirement specifiers from PEP 508.

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