An instance of the default implementation of the Utf8Codec.
This instance provides a convenient access to the most common UTF-8 use cases.
Examples:
var encoded = UTF8.encode("Îñţérñåţîöñåļîžåţîờñ");
var decoded = UTF8.decode([0x62, 0x6c, 0xc3, 0xa5, 0x62, 0xc3, 0xa6,
0x72, 0x67, 0x72, 0xc3, 0xb8, 0x64]);