changelog: optimize delayed updates for clone vs pull
pull index updates get redirected to memory, then appended on finalize
clone index updates get sent to 00changelog.i.a, then renamed on finalize
#header#
<title>Mercurial Error</title>
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<h2>Mercurial Error</h2>
<p>
An error occured while processing your request:
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#error|escape#
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