VersionedFile.walk deprecated?

[Aaron Bentley]

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VersionedFile.walk is deprecated, and
iter_lines_added_or_present_in_versions is suggested as a replacement.
This doesn't appear to be a complete replacement, because it doesn't
include deletion information.

Deleted lines behave very differently from never-present lines when
performing a weave merge.  (Bram Cohen refers to the three states as
"unborn", "living" and "killed", IIRC.)

Is this deprecation warranted?

Aaron
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