[node-dev] Safe to use socket.ondata instead of on('data')?

[Joran Greef]

I spotted this in the source of net.js:

// Optimization: emit the original buffer with end points
    if (self.ondata) self.ondata(buffer, offset, end);

Is it safe to use ondata to avoid the buffer.slice overhead introduced when 
otherwise calling on('data') callbacks?