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Fix standalone month alias cache leakage #1263

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Fix standalone month alias cache leakage #1263

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2 changes: 1 addition & 1 deletion babel/localedata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -269,7 +269,7 @@ def __getitem__(self, key: str | int | None) -> Any:
val = alias.resolve(self.base).copy()
merge(val, others)
if isinstance(val, dict): # Return a nested alias-resolving dict
val = LocaleDataDict(val, base=self.base)
return LocaleDataDict(val, base=self.base)
if val is not orig:
self._data[key] = val
return val
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19 changes: 18 additions & 1 deletion tests/test_dates.py
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Expand Up @@ -16,7 +16,7 @@
import freezegun
import pytest

from babel import Locale, dates
from babel import Locale, dates, localedata
from babel.dates import NO_INHERITANCE_MARKER, UTC, _localize, parse_pattern
from babel.util import FixedOffsetTimezone

Expand Down Expand Up @@ -561,6 +561,23 @@ def test_format_date():
"Sun, Apr 1, '07")


@pytest.mark.parametrize(
('locale', 'expected'),
[
('de', 'Oktober'),
('he', 'אוקטובר'),
('no', 'oktober'),
('fr', 'octobre'),
],
)
def test_format_date_standalone_month_name_isolation(locale, expected):
localedata._cache.clear()
d = date(2025, 10, 1)

assert dates.format_date(d, 'LLLL', locale='he') == 'אוקטובר'
assert dates.format_date(d, 'LLLL', locale=locale) == expected


def test_format_datetime(timezone_getter):
dt = datetime(2007, 4, 1, 15, 30)
assert (dates.format_datetime(dt, locale='en_US') ==
Expand Down