Add the hasBinary flag

lib/socket.js

@@ -141,9 +141,17 @@ Socket.prototype.emit = function(ev){
   if (~exports.events.indexOf(ev)) {
     emit.apply(this, arguments);
   } else {
-    var args = Array.prototype.slice.call(arguments);
+    var args = Array.prototype.slice.call(arguments),
+        type = parser.EVENT;
+
+    if (this.flags.hasBinary === undefined) {
+       hasBin(args) && (type = parser.BINARY_EVENT);
+    } else {
+       this.flags.hasBinary && (type = parser.BINARY_EVENT);
+    } 
+
     var packet = {
-      type: hasBin(args) ? parser.BINARY_EVENT : parser.EVENT,
+      type: type,
       data: args
     };
 
@@ -481,6 +489,20 @@ Socket.prototype.compress = function(compress){
   return this;
 };
 
+/**
+ * Sets the hasBinary flag
+ *
+ * @param {Boolean} Encode as if it has binary data if `true`, Encode as if it doesnt have binary data if `false`
+ * @return {Socket} self
+ * @api public
+ */
+
+ Socket.prototype.hasBinary = function (bool) {
+   this.flags = this.flags || {};
+   this.flags.hasBinary = bool;
+   return this;
+ };
+
 /**
  * Dispatch incoming event to socket listeners.
  *