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Fix GH-21738: undefined behavior in isxdigit() callsites with non-ASCII bytes #21861

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Extend isxdigit() UB fix to quoted_printable_decode and stripcslashes

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Fix GH-21738: undefined behavior in isxdigit() callsites with non-ASCII bytes #21861

Extend isxdigit() UB fix to quoted_printable_decode and stripcslashes
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succeeded Apr 30, 2026 in 4s