For your actual problem:
Did you tried a simple:

$name =~ s/\s+$//;
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which should do the trick.

For your display problem:
In general you can use pack/unpack for conversions.
Here I would just use:

use Data::Dumper;
$Data::Dumper::Useqq = 1;

print Dumper $name;
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which would print $VAR1 = "12345\t\n"; in your example.