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$phi is passed the next median value. If it returns true upon execution,
then the search terminates.

If the above two fails, then $hi and $lo are re-computed for the next
iteration.

=head2 search_next(%opts)

Performs a "linear" search until some condition is met. This is a generalized
version of the formula defined in [1] p.22. The basic idea is :

  x = base
  while (! check(x) ) {
     x = next(x);
  }
  return x

%opts can contain the following parameters:

=over 4