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[3.15] gh-161096: Reject invalid TZif abbreviation block sizes in zoneinfo (GH-161097) - #161122
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…in zoneinfo (pythonGH-161097) ZoneInfo.from_file() now raises ValueError for a negative charcnt or one above 512, and reads the abbreviation index as unsigned. ANT-2026-W7U7UDLT (cherry picked from commit e9f37a3)
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(cherry picked from commit e9f37a3)
ZoneInfo.from_file()accepts any TZifcharcntand can use 512x the file size in memory #161096