What's the deal with MemoryTree?

[Aaron Bentley]

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Justyn Butler wrote:
> Except all is not quite well, because MemoryTree appears to be limited
> in how far it can emulate a working tree. Merging is my current
> struggle.

If you want to merge, I recommend generating a TransformPreview and
committing it.  You're right that MemoryTrees aren't a complete
emulation of a WorkingTree.  TransformPreviews and the PreviewTrees they
generate are much more faithful.  I don't anticipate us supporting
merging into a MemoryTree any time soon.  There's no reason to, since
you can already merge and generate a PreviewTree, or just commit the
TransformPreview directly.

Aaron
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