the file Deep.pm is encoded as iso-8859 (Deep.pm: Perl5 module source,
ISO-8859 text)
this is due to a small comment on line 305 : # caractères a echapper
dans les valeurs
This cause spurious warnings :
utf8 "\xE8" does not map to Unicode at
..../perl-5.12.2/lib/site_perl/5.12.2/Data/Deep.pm
Just remove the accent and the code will be in pure ascii