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       @lines entry => [(increasing) list of matching indices]

=item callback(@lines)

Generates a closure capturing the object and line_map hash for @lines.
Most useful when computing multiple LCSs against a single file.

=item LCS(\@a,\@b)

Finds a Longest Common Subsequence, taking two arrayrefs as method
arguments.  In scalar context the return value is the length of the
subsequence.  In list context it yields a list of corresponding
indices, which are represented by 2-element array refs.  See the
L<Algorithm::Diff> manpage for more details.

=back

=head2 EXPORT

ADLCS() and LCSidx().  See Algorithm::Diff for the APIs.