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        "start"   => N,
        "changes" => [[OP1, DATA1], ..., [OPn, DATAn]],
    }

Where "start" is a line number in the I<target> array, indicating
where this hunk is intended to be applied, and "changes" contains the
changes to apply.

Optimiser callbacks should return a I<permuted copy> of what they were
passed. Empty diffs will be discarded automatically. If only one diff
remains after processing, the conflict will have been optimised away
completely.

=head2 Conflict Resolver Callbacks

Resolver callbacks are invoked when conflicts have been detected, and
the optimisers weren't able to completely factor away the conflict
block.

The job of a resolver callback is to return some kind of resolution of
the conflicting sub-arrays. These subs are called a little like this: