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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mkdir t

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cd t

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hg init

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echo a > a

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hg add a

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hg commit -m "test" -d "1000000 0"

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hg verify

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hg parents

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hg status

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hg rollback

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hg verify

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hg parents

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hg status