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The tag names are whatever you labelled the diff sequences you passed
to C<apply_diffs()>. By definition, a conflict block contains a subset
of at least two separate diffs.

Each of the C<$hunk_X_X> scalars in the arguments above is a hash
reference with the following structure:

    {
        "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.