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Things which should be straightforward:
* The `--sdiff-merge-assist' option is accepted but does nothing. What
precisely does it do anyway?
* Optimise the case of the --brief output style, where a full-blown diff
isn't necessary but we currently do it.
* We currently aren't careful about noticing the difference between a
file which has a return/new line on the last line and one which
doesn't. In "robust" output styles, this should result in a warning.
Admittedly this distinction has never made a difference to any
diffing I've done, but if we're going try to be compliant...
* We do produce the minimal diff (at least if --minimal is enabled we
do), but we don't produce the "prettiest" diff. We should post-
process our diffs to make them prettier.
Things which need a bit more work:
* Implement --speed-large-files (or at least examine whether or not
it's worth it to do so).
* Support diffing of binary files. Mostly this just requires being
more careful than we currently are.
Things which would be nice but may/will require a lot of work:
* Implement a "regexp" module so we can handle more options.
* Output file dates on context/unified diffs.
* Directory diffs.
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