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The ISO-2022 decoders checked only that a designated charset belonged to the encoding, not that it went to the code element the encoding assigns it to.
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iso2022processesc()now requires the designation table entry's plane to match the G set the escape designates to, and accepts ASCII only for G0. Conforming encoders (including ours) never emit the escapes this rejects, but strict decoding of such malformed data now raisesUnicodeDecodeErrorwhere it used to return wrong text, so this is for main only.The
RuntimeErroralone could be fixed in maintenance branches by havingiso2022processg2()return an ordinary decode error instead ofMBERR_INTERNAL.Fixes #160187
ANT-2026-TH3IZKXQ