fractions: remove _normalize, update for py312 (#10218)

stdlib/fractions.pyi

@@ -22,11 +22,9 @@ else:
 
 class Fraction(Rational):
     @overload
-    def __new__(
-        cls, numerator: int | Rational = 0, denominator: int | Rational | None = None, *, _normalize: bool = True
-    ) -> Self: ...
+    def __new__(cls, numerator: int | Rational = 0, denominator: int | Rational | None = None) -> Self: ...
     @overload
-    def __new__(cls, __value: float | Decimal | str, *, _normalize: bool = True) -> Self: ...
+    def __new__(cls, __value: float | Decimal | str) -> Self: ...
     @classmethod
     def from_float(cls, f: float) -> Self: ...
     @classmethod
@@ -34,6 +32,8 @@ class Fraction(Rational):
     def limit_denominator(self, max_denominator: int = 1000000) -> Fraction: ...
     if sys.version_info >= (3, 8):
         def as_integer_ratio(self) -> tuple[int, int]: ...
+    if sys.version_info >= (3, 12):
+        def is_integer(self) -> bool: ...
 
     @property
     def numerator(a) -> int: ...

tests/stubtest_allowlists/py3_common.txt

@@ -407,6 +407,10 @@ pickle.Unpickler.memo  # undocumented implementation detail, has different type
 re.Pattern.scanner  # Undocumented and not useful. #6405
 tempfile._TemporaryFileWrapper.[\w_]+  # Dynamically specified by __getattr__, and thus don't exist on the class
 
+# Removed undocumented and often mistakenly used _normalize parameter that was removed in 3.12
+# On 3.12, stubtest doesn't correctly combine the overload because parameter names mismatch
+fractions.Fraction.__new__
+
 # Details of runtime definition don't need to be in stubs
 typing_extensions\._SpecialForm.*
 typing_extensions\.TypeVar.*