Github user rnewson commented on the pull request:
https://github.com/apache/couchdb-couch/pull/24#issuecomment-68453103
Use the md5 digest as a strong hint that we've seen this content before,
but verify for byte identity (read both attachments, compare exhaustively), and
obviously there needs be a unique key (I'm thinking {MD5, Count}, so
{<<"foobar..">>, 0}, {<<"foobar...">>, 1}).
Shorter version: You may only remove duplicate copies of data after you've
compared for true duplication, a digest (even a stronger one than MD5) is not
sufficient.
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