func utf8_encoder(Number code) {
    code.chr.encode('UTF-8').bytes.map{.chr}
}

func utf8_decoder(Array bytes) {
    bytes.map{.ord}.decode('UTF-8')
}

for n in ([0x0041, 0x00F6, 0x0416, 0x20AC, 0x1D11E]) {
    var encoded = utf8_encoder(n)
    var decoded = utf8_decoder(encoded)
    assert_eq(n, decoded.ord)
    say "#{decoded} -> #{encoded}"
}