o fix comments.
o fix loop label name.
o more correct initialization if could.
o use //o;

change the match conditoin parameter name to "match_condition".  You
should specify "first" or "last" as match_condition in
Tie::JournaledFile::new() method.

Tie::JournaledFile: change default match condition to "last match".

clean up variable names.
inform error by croak() more.