ok, lets do it that way.
it's unsafe if we ever rewind a commit that you rely on later, and
git-gc zaps it from tip.git?
i think it would be better to not rely on that yet. The overwhelming
majority of activities in tip.git are append-only, but the integration
branches (which are included in tip/master) get regenerated frequently.
If you base on a topic branch itself (say tip/x86/nmi) - that should be
pretty stable.
Ingo
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