It is NOT the capitalization that is needed. Encode is case-insensitive for the encoding. It is the hyphen that makes the difference, see this example: 
use Encode qw(resolve_alias);

my @aliases = ('utf-8', 'UTF-8', 'utf8',);

for my $alias ( @aliases ) { 
my $canonical_name  = Encode::resolve_alias($alias);
print "$alias \t has canonical name $canonical_name\n";
}

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In reply to Re^3: Perl and Postgresql: Invalid byte sequence for encoding "UTF8" by Anonymous Monk
in thread Perl and Postgresql: Invalid byte sequence for encoding "UTF8" by StoneTable

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