The diff commands 'git-diff-index', 'git-diff-files', and 'git-diff-tree'
can be told to manipulate differences they find in
-unconventional ways before showing `diff` output. The manipulation
+unconventional ways before showing 'diff' output. The manipulation
is collectively called "diffcore transformation". This short note
describes what they are and how to use them to produce 'diff' output
that is easier to understand than the conventional kind.