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Unlike EUC-JP, EUC-KR, Shift_JIS round-trips between U+0080 and 0x80. Is it intentional? I haven't seen other Shift_JIS converter that does that.
Is it only Gecko that does this? What about Internet Explorer? It might be that Presto and Gecko did this and that I thought preserving it would be less harmful than converting to U+FFFD. (If you don't have time to answer the questions, don't worry, I'll get around to it eventually.)
Gecko started to do this for compatiblity with Internet Explorer.
Thanks, in that case this is indeed intentional.