-utf8 not applied everywhere

This is my script, and it prints gibberish:

``` perl
#!/usr/bin/perl

use v5.18;
use warnings;
use IO::All -utf8;

binmode 'STDOUT', ':utf8';
my $line = io('name.txt')->[0];
say $line;
```

This is `name.txt`:

```
ΑΛΕΞΑΝΔΡΟΣ
```

The  problem is that :encoding(utf8) is not applied when using io('name.txt') as an arrayref.
