Comment 4 for bug 755642

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Martin Pool (mbp) wrote : Re: [Bug 755642] Re: calculating testament sha1 is very slow

I think (1) is probably a reasonable way to go: a validator that
changes only when the tree format changes will be stable enough to be
useful. We'll have to check firstly that it actually is stable across
everything but a format upgrade, and secondly that it does include
every important aspect of the tree.

Martin