[sup-devel] Accept ASCII_8BIT in String.check

[Johann Klähn <kljohann@gmail.com>]

I was having problems with encoded emails. Using archlinux / ruby
1.9.1_p378 Iconv.iconv returns the encoding ASCII_8BIT,
which was rejected by String.check.

Before I was getting debug messages like this when converting mails or
building the index:
 couldn't transcode text from ISO-8859-1 (ISO-8859-1) to utf8) (...)
(got unexpected encoding ASCII-8BIT (String::CheckError))
My String.check now contains:
  if respond_to?(:encoding) && !(encoding == Encoding::UTF_8 ||
encoding == Encoding::ASCII || encoding == Encoding::ASCII_8BIT)
And everything is working as expected. Instead of text.ascii the real
umlauts are displayed.

Hope that helps,
Johann
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