Fixed equality for HalfVector with signed zeros - resolves #164

Co-authored-by: Zhuo Zhao <193034689+chaduo@users.noreply.github.com>

Author: ankane

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.2 (unreleased)
+
+- Fixed equality for `HalfVector` with signed zeros
+
 ## 0.5.1 (2026-10-08)
 
 - Fixed error with non-canonical SciPy sparse arrays

pgvector/halfvec.py

@@ -37,7 +37,7 @@ def __repr__(self) -> str:
     def __eq__(self, other: object, /) -> bool:
         if not isinstance(other, self.__class__):
             return NotImplemented
-        return self._value == other._value
+        return self.to_list() == other.to_list()
 
     def dimensions(self) -> int:
         return len(self._value)

tests/test_half_vector.py

@@ -55,6 +55,7 @@ def test_equality(self) -> None:
         assert HalfVector([1, 2, 3]) == HalfVector([1, 2, 3])
         assert HalfVector([1, 2, 3]) != HalfVector([1, 2, 4])
         assert HalfVector([1, 2, 3]) != 1
+        assert HalfVector([0.0]) == HalfVector([-0.0])
 
     def test_dimensions(self) -> None:
         assert HalfVector([1, 2, 3]).dimensions() == 3

tests/test_vector.py

@@ -55,6 +55,7 @@ def test_equality(self) -> None:
         assert Vector([1, 2, 3]) == Vector([1, 2, 3])
         assert Vector([1, 2, 3]) != Vector([1, 2, 4])
         assert Vector([1, 2, 3]) != 1
+        assert Vector([0.0]) == Vector([-0.0])
 
     def test_dimensions(self) -> None:
         assert Vector([1, 2, 3]).dimensions() == 3