[MERGE] Stacking policy

[Aaron Bentley]

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Jonathan Lange wrote:
> If I understand correctly, older BzrDirs will need to be updated to
> accept this new parameter.

Correct, and fixed in my reply to Ian.

> For my use case — automated initial mirrors of stacked branches — the
> could either silently ignore the parameter or raise some sort of
> distinguishable error when preserve_stacking is True.

If the source is not stacked, then I think preserve_stacking ought to
have no effect.  I don't think it matters whether the source supports
stacking or not, in that case.

Aaron
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