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 dir

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cd dir

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echo bleh > bar

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hg add bar

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hg ci -m 'add bar'

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hg cp bar foo

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echo >> bar

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hg ci -m 'cp bar foo; change bar'

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hg debugrename foo

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hg debugindex .hg/data/bar.i