import std.string : representation;
//Basic case
assert("test".representation.toUTF8String == "test");
//ISO-8859-1
assert([cast(ubyte)0xA9].toUTF8String == "©");
//Truncated utf-8 will be treated as fallback encoding
assert("©".representation[0..1].toUTF8String == "Â");
Decodes a byte array to a UTF-8 string. Old IRC clients don't use UTF-8, but it is a simple matter to detect and convert those strings. Lines truncated mid-codepoint by the protocol's line length will be treated as invalid UTF-8.