Mojo::Util: punycode encoding/decoding doesn't roundtrip

[karenetheridge]

use v5.42;
use utf8;
use open ':std', ':encoding(UTF-8)';
use Mojo::Util 'punycode_encode', 'punycode_decode';

say "encoded ☃⭐️ -> ", punycode_encode("☃⭐️");
say "roundtrips to -> ", punycode_decode(punycode_encode("☃⭐️"));

prints:

encoded ☃⭐️ -> g7ix603e
roundtrips to -> ︑⭑

These characters are:

• U+2603 - snowman
• U+2b50 - star

Picking through exactly what is going wrong is tricky though!

[karenetheridge]

I found another weird one: "☃🍓" roundtrips to "🍔".