Initial.
Test support for long records.
Refactor.
Refactor.
Sort non-ASCII characters.
Add clear
Add intersection()
Add merge
Drop inheritance from Pathname.
Add more comments.
Rename param to path.
Protect comm.
Refactor infile utility param list.
Protect sort method.
Refactor infile return value.
Cleanup.
Protect #sorted
Add #subtract
Replace public constants.
Drop dos2unix conversion.
Initialize bufsiz option.