G'day hippo,

As you can see, I made some serious attempts to choose the best Perl version. There are, of course, other considerations such as platforms and available fonts; for instance, check parv's shell problems.

"There is probably no way to be able to tell reliably from within the script whether these codepoints will be rendered correctly by the terminal ..."

As an absolute statement, I would have to agree; however, there are ways to mitigate this. In a recent module (Tk::Aux::Font) that I wrote — purely for my own use — I had this subroutine:

sub _best_family {
    my ($mw, $type) = @_;

    state $families = {
        sans => ['Verdana', 'DejaVu Sans', 'Helvetica'],
        serif => ['Times New Roman', 'DejaVu Serif', 'Times'],
        mono => [
            'Menlo', 'Andale Mono', 'Lucida Console',
            'Consolas', 'Courier New', 'Courier'
        ],
        emoji => ['Times New Roman', 'DejaVu Serif', 'Times'],
    };

    my $actual_family;

    for my $family ($families->{$type}->@*) {
        my $test_font = $mw->fontCreate(-family => $family);
        $actual_family = $mw->fontActual($test_font, '-family');
        last if $actual_family eq $family;
    }

    return $actual_family;
}
[download]

Whilst developing, I tweaked this multiple times, especially with respect to the actual font order for various families. My overall findings were that "sans" and "mono" failed to produce many glyphs; "serif" and "emoji" (in this instance, the same lists) rendered many more. On my Win10/Cygwin, "Times New Roman" was the best; "DejaVu Serif" came a very close second (it seemed to render glyphs a pixel or two below the optimal position); "Times" was OK but resolution was poor and I'd rank it as a poor third cousin.

Based on all of this, I'd recommend that you render with "DejaVu Serif", instead of "DejaVu Sans".

Please bear in mind that was, as stated, intended to be "a little more visually appealing"; it solves no bugs nor improves any optimisations. It's possibly a nice-to-have but never essential.

If it's of any use, here's a relevant extract from my local CSS:

:root {
    --font-pref-sans-serif: "Verdana";
    --font-pref-serif:      "Times New Roman";
    --font-pref-monospace:  "Menlo", "Andale Mono", "Lucida Console", 
+"Courier New";
    --font-manuscript-base: "Junicode";
    --font-alchemy-base:    "Newton Sans Regular";
    --font-emoji-base:      "Apple Color Emoji",
                            "Segoe UI Emoji",
                            "EmojiOne",
                            "AndroidEmoji",
                            "emojidex",
                            "fxemoji",
                            "NotoColorEmoji",
                            "Twemoji";
    --font-symbol-base:     "Symbola";
}
:root {
    --font-std-sans-serif:  var(--font-pref-sans-serif), sans-serif;
    --font-std-serif:       var(--font-pref-serif), serif;
    --font-std-monospace:   var(--font-pref-monospace), monospace;
    --font-std-cursive:     cursive;
    --font-std-fantasy:     fantasy;
}
:root {
    --font-manuscript:      var(--font-manuscript-base),
                            var(--font-std-serif);
    --font-alchemy:         var(--font-alchemy-base),
                            var(--font-std-sans-serif);
    --font-emoji:           var(--font-emoji-base),
                            var(--font-std-monospace),
                            var(--font-std-sans-serif);
    --font-symbol:          var(--font-symbol-base),
                            var(--font-std-monospace),
                            var(--font-std-sans-serif);
    --font-emoji-or-symbol: var(--font-emoji-base),
                            var(--font-std-monospace),
                            var(--font-std-sans-serif);
                            /*
                            var(--font-symbol-base);
                            */
    --font-unicode-raw:     var(--font-pref-serif),
                            var(--font-symbol-base),
                            serif,
                            var(--font-std-sans-serif),
                            var(--font-std-monospace),
                            var(--font-std-cursive),
                            var(--font-std-fantasy);
}
[download]

Based on all of this, I'd recommend that you render with "DejaVu Serif", instead of "DejaVu Sans".

Having just tried that I regret to report that it has made no difference. There's also no real mono DejaVu Serif available so the terminal just looks awful too. :-)

It will doubtless all work fine when I get around to upgrading.

---

🦛

It's unfortunate this didn't work for you. The Unicode® version required (9.0) is fairly old; and a reasonably old Perl version should have handled it.

Of course, OS versions, command line capabilities, and so on, make all the difference. When you "get around to upgrading" perhaps your outcome might be more favourable.

I'm sorry I'm unable to provide further assistance with this.

— Ken