There are times I need to pass a seq as a pointer and byte-count, usually to C
code but sometimes to Nim code like AsyncSocket.send.
If I do it like this:
socket.send(addr data[0], data.len)
Run
it unfortunately raises a RangeError when `data` is empty. So I have to
complicate my code with an `if` test.
**Is there a way to get the address of a seq 's items, that doesn't have this
problem?** (`addr data` doesn't work because it gives the address of the seq
itself, which starts with a length field not the data.)
