Tickets :: Comment on [#10054] Subject didn't encode with attachment

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Comment	> Is Big-5 one of those charsets that only contains ASCII characters, > even though it represents an 8+bit representation? That would > explain this behavior. See, e.g., Horde_mime::is8bit: > > /* ISO-2022-JP is a 7bit charset, but it is an 8bit representation so > * it needs to be entirely encoded. */ > return is_string($string) && > ((stristr('iso-2022-jp', $charset) && > (strstr($string, "\x1b\$B"))) \|\| > preg_match('/[\x80-\xff]/', $string));
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