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Specify arbitrary equality case insensitivity. #1959

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Merged
merged 2 commits into from
Nov 25, 2025
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Specify arbitrary equality case insensitivity. #1959

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Specify arbitrary equality case insensitivity.
notatallshaw Nov 22, 2025
97a72c5
Update source/specifications/version-specifiers.rst
notatallshaw Nov 25, 2025
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6 changes: 4 additions & 2 deletions source/specifications/version-specifiers.rst
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Expand Up @@ -1016,8 +1016,9 @@ Arbitrary equality

Arbitrary equality comparisons are simple string equality operations which do
not take into account any of the semantic information such as zero padding or
local versions. This operator also does not support prefix matching as the
``==`` operator does.
local versions. The comparison MUST treat ASCII letters case-insensitively, e.g.
by lowercasing, and is unspecified for non-ASCII text. This operator also does
not support prefix matching as the ``==`` operator does.

The primary use case for arbitrary equality is to allow for specifying a
version which cannot otherwise be represented by this specification. This operator is
Expand Down Expand Up @@ -1271,3 +1272,4 @@ History
- August 2014: This specification was approved through :pep:`440`.
- May 2025: Clarify that development releases are a form of pre-release when
they are handled.
- Nov 2025: Specify arbitrary equality case insensitivity.