When it is not told to.
The Porcelainish commands (git-diff, git-show) default to
recursive, but low-level commands don't.
Compare these three:
git diff --raw v1.4.3.1^^^..v1.4.3.1^^
git diff-tree v1.4.3.1^^^..v1.4.3.1^^
git diff-tree -r v1.4.3.1^^^..v1.4.3.1^^
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