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I briefly looked at 'svn diff' and didn't see a way to get it to output binary files in diffs. Diff utilities often don't support binary diffs because their output is textual and meant to be somewhat human readable.
You may have more luck with one of the following two methods for creating a review of a merge:
For pre-commit reviews:
1) Perform a merge into your working copy.
2) Use '
addchanges' to create a review.
Or, for post-commit reviews:
1) Perform a merge.
2) Commit the merge.
3) Use '
addchangelist' to review the committed changes.
