datetime fold value cleanup on increment #137752
Description
Bug report
Bug description:
Add one microsecond to datetime with fold=1 and this fold is cleanup and we go to the past instead of go to one microsecond ahead
from datetime import datetime, timedelta
from zoneinfo import ZoneInfo
tz = ZoneInfo('Europe/Paris')
dt1 = datetime(2025, 10, 26, 2, 0, 1, tzinfo=tz)
print(dt1)
dt2 = datetime(2025, 10, 26, 2, 0, 1, fold=1, tzinfo=tz)
print(dt2)
dt3 = dt2 + timedelta(microseconds=1)
print(dt3)CPython versions tested on:
3.13
Operating systems tested on:
Linux