Use unsigned version format. This way can use one additional bit, and when encountering invalid revlogs with the first bit set don't produce python warnings or strange error messages.

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#!/bin/sh

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echo "[extensions]" >> $HGRCPATH

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echo "mq=" >> $HGRCPATH

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hg init a

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cd a

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echo 'base' > base

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hg ci -Ambase -d '1 0'

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hg qnew -mmqbase mqbase

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hg qsave

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hg qrestore 2