In draft-75/76, passing a number to text() or frame() results in the
sender allocating a buffer of that size and sending it to the other
peer, leaking random blocks of memory.
In hybi, a call to text(), binary() or ping() with a number will fail,
because the input is expected to be a buffer and so an internal method
call fails.
Both kinds of driver now convert numbers to strings, which is what
browsers do with calls to send().
James Coglan