Function proxy

public/javascripts/socket.io.js:6292–6307

(err, result)

	    return (count === 0) ? callback() : proxy

	    function proxy(err, result) {
	        if (proxy.count <= 0) {
	            throw new Error('after called too many times')
	        }
	        --proxy.count

	        // after first error, rest are passed to err_cb
	        if (err) {
	            bail = true
	            callback(err)
	            // future error callbacks will go to error handler
	            callback = err_cb
	        } else if (proxy.count === 0 && !bail) {
	            callback(null, result)
	        }
	    }
	}

	function noop() {}