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Ban negative extras (extra != markers) #2085

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Ban negative extras (extra != markers) #2085

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5 changes: 2 additions & 3 deletions source/specifications/dependency-specifiers.rst
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Expand Up @@ -457,9 +457,8 @@ DO NOT need to define these fields.

The ``extra`` field is also special, as it expects set-like behaviour, but
predates the addition of ``Set of strings`` as a defined marker field type.
Accordingly, ``extra == "name"`` in a dependency declaration is similar to
``"name" in extras``, while ``extra != "name"`` is similar to
``"name" not in extras``. For dependency marker evaluations, the set of extra
It only supports one operation, ``extra == "name"``, which is similar to
``"name" in extras``. For dependency marker evaluations, the set of extra
names used for these comparisons is the full set of requested extras for *that
particular package*, whether requested directly in a top level dependency
declaration, or indirectly in a transitive dependency declaration. Other
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