Sourced from cython's changelog.

3.1.2 (2025-06-09)

Bugs fixed

• Attribute lookups failed on the bool builtin type. (Github issue :issue:6905)

• Type checks on or-ed union types could incorrectly return false. (Github issue :issue:6420)

• Negative list indexing could accidentally wrap around twice in PyPy and the Limited API.

• Iterating over literal sequences with starred (unpacked) items could infer a wrong type for the loop variable and fail to assign the values. (Github issue :issue:6924)

• Calls to C functions taking exception types failed to check for a None argument. (Github issue :issue:6420)

• Fused functions had an incorrect __module__ attribute. (Github issue :issue:6897)

• The type of Cython implemented functions had an incorrect __module__ attribute. (Github issue :issue:6841)

• Errors while indexing into bytearray or str in nogil sections could crash. (Github issue :issue:6947)

• bytearray.append() could silently accept some invalid character numbers.

• The C++11 <type_traits> header was included regardless of the C++ version. (Github issue :issue:6896)

• PyDict_GetItemStringRef() was accidentally used in older Limited API versions. (Github issue :issue:6914)

• abort() was used but not always available in the Limited API. (Github issue :issue:6918)

• Some dependencies were missing from the depfile. (Github issue :issue:6938)

• Embedded function signatures were not always separated from the existing docstring. (Github issue :issue:6904)

• numpy.math was missing from Cython/Includes/ and could not be cimported. (Github issue :issue:6859)

... (truncated)

• 51f471d Bump ccache action version (GH-6955)
• 40c2324 Update changelog.
• 98b70ee Fixup shared metaclass in 3.1.x (GH-6953)
• 59e2502 Make sure we correctly reject large negative integer values in "bytearray.app...
• 466891c Use an explicit cast to avoid a C conversion warning.
• b0d6aa1 Prepare release of 3.1.2.
• 0440d5f Update changelog.
• e860884 Fix __module__ attribute of shared types with metaclass (#6882)
• 5e9d7ad Build: Explicitly include "numpy/math.pxd" again.
• ea65182 Fix error handling in nogil indexing of bytearray and str (#6947)
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