Strange, Iconv says that 'ASCII-8BIT' encoding is uncknown:

  require 'iconv'
  Iconv.conv('ASCII-8BIT', 'UTF-8',
"\xD0\x90\xD0\xBB\xD0\xB5\xD0\xBA\xD1\x81")

  test.rb:29:in `conv': invalid encoding ("ASCII-8BIT", "UTF-8")
(Iconv::InvalidEncoding)
    from test.rb:29:in `<main>'

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