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First of all, thanks for your work.
Please, note that a version 0.05-14 including most of your improvements (and others) was uploaded to
experimental on 06 Apr 2012.
libfilesys-diskspace-perl went collab-maint on that version and is located at Debian's git
repository , so if you prefer, feel free to make any improvement on the package commiting
directly there, from now on.
Now my intention is to ask Lucas for a rebuild against the experemental package to see if #666580
went away on amd64.
Anyway, I'll review your changes to see if I can include any of them.