[REGRESSION][MERGE] Knit indexes incorrect with unicode keys

[Aaron Bentley]

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Robert Collins wrote:
> This patch fixes a regression introduced by the utf8 cache [I think]
> where we fail to decode unicode keys in the knit index.

Bundle Buggy didn't notice this one because the subject didn't *begin*
with "[MERGE".  Should I relax the rules to match [MERGE anywhere in the
subject?

(Oh, and it didn't recognize the other one as a bundle because the
newlines were CRLF)

Aaron
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