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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hg init

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mkfifo p

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hg serve --stdio < p &

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P=$!

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(echo lock; echo addchangegroup; sleep 5) > p &

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Q=$!

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sleep 3

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kill -HUP $P

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wait

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ls .hg

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