Teach bdiff to support buffer objects manifest.add gives revlog.addrevision a buffer object, which may be cached and used for a second call in the same session (as mq does when pushing multiple patches). The other option would be to cast the buffer to str when caching it.

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#header#

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    <title>#repo|escape# Changelog</title>

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    <description>#repo|escape# Changelog</description>

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    #entries%changelogentry#

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