Ferret talk - Jan 2007 - multibyte character corrupt in highlight method

When I apply highlight() method to the search result,
multibyte characters are corrupted.
The post_tag is located in the middle of last character,
so the last character corrupts.

Here is my code.

query = "SOME_MULTIBYTE_CHARS"
searcher.search_each(query) do |doc_id, score|
  puts searcher.highlight(query, doc_id, :field => :content)
end

And this is the result.

... bla, bla, bla, .. <b>SOME_MULTIBYTE_CHARA</b>CTERS ...

How can I do??

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