https://issues.dlang.org/show_bug.cgi?id=15586
--- Comment #4 from hst...@quickfur.ath.cx --- Keep in mind, though, that one *could* argue that casting an arbitrary value to dchar already constitutes UB, if dchars are deemed to only contain valid Unicode codepoints. If you need to work with incoming character data of unknown validity, you're probably better off working with uint (or uint[], ubyte[], etc.) instead, and only convert to dchar (string, etc.) after explicit validation. Generally, you probably shouldn't be casting stuff unless you know what you're doing and are ready to handle the consequences when things go wrong. --
