Even a single byte buffer is not enough, you need a bool to
indicate the stream
is done.
Right. But empty for a stream still has to read. Just follow
the protocol, and the range will work, even with streams.
The protocol is not intuitive. I'm not entirely against having to
call something to do lazy initialization but it's not like anyone
will expect empty @property to lazily initialize.
Empty and front could be methods added by a mixin template which
would use efficient methods with strict protocol implemented by
the user.
