Here's a test program: 

#!/usr/bin/perl 

use strict;
use warnings;

use Test::More tests => 8;

use Data::Dumper qw( Dumper );
use DBM::Deep    qw();
use File::Temp   qw( tempfile );

my ($fh, $fn) = tempfile();
my $db = DBM::Deep->new( $fn );

sub _u { utf8::upgrade(   my $s = $_[0] ); $s }
sub _d { utf8::downgrade( my $s = $_[0] ); $s }

$db->{A} = "\x61";
$db->{B} = _d("\xA0");
$db->{C} = _u("\xA0");
$db->{D} = "\x{2660}";

$db->{"\x61"    } = 1;
$db->{_d("\xA0")} = 1;
$db->{_u("\xA0")} = 1;
$db->{"\x{2660}"} = 1;

my @keys = sort keys %$db;

is( 0+@keys, 7, "Num keys" )
    or diag('Got ' . do {
        local $Data::Dumper::Useqq = 1;
        local $Data::Dumper::Terse = 1;
        local $Data::Dumper::Indent = 0;
        Dumper(\@keys)
    });

is( $keys[4], "\x61",     "7-bit key" );
is( $keys[5], "\xA0",     "8-bit key" );
is( $keys[6], "\x{2660}", "32-bit key" );

is( $db->{A}, "\x61",     "7-bit val" );
is( $db->{B}, "\xA0",     "8-bit val (UTF8=0)" );
is( $db->{C}, "\xA0",     "8-bit val (UTF8=1)" );
is( $db->{D}, "\x{2660}", "32-bit val" );

[download]

Output: 

1..8
Wide character in print at /home/eric/lib/perl5/DBM/Deep/File.pm line 
+193.
# Looks like your test exited with 9 before it could output anything.

[download]

To validate the test, I ran it after replacing
my $db = DBM::Deep->new( $fn );
with
my $db = {};

Update: Fixed bugs in test.

In reply to Re: "wide character in print" error in DBM::Deep by ikegami
in thread "wide character in print" error in DBM::Deep by jdporter

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