I don’t really see the value in considering it a subclass of a string. Without decryption, the only meaningful “string-like” operations on it are equality (well

I don’t really see the value in considering it a subclass of a string. Without decryption, the only meaningful “string-like” operations on it are equality (well, even that’s assuming that like strings share encrypted values, or equality is stored in a separate property). Why even make it a subclass of string in the first place?