What is KnitPackStreamSource _for_

[John Arbash Meinel]

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Robert Collins wrote:
> It has a docstring that documents its assumptions, but not why its
> needed. The generic StreamSource should be able to perform equally.
> 
> John - could you expand on why it exists (ideally as a patch).
> 
> -Rob

I just realized you may be asking:

For Fetching between a KnitPack format repository (1-6, rich-root,
non-rich-root, subtree, etc.) when both the source and target are
identical formats.

John
=:_>
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