Improved element ids, suggested by @dpcouch

dev/raphael.core.js

@@ -369,7 +369,6 @@ define(["eve"], function(eve) {
     \*/
     R.fn = paperproto = Paper.prototype = R.prototype;
     R._id = 0;
-    R._oid = 0;
     /*\
      * Raphael.is
      [ method ]

dev/raphael.svg.js

@@ -658,8 +658,17 @@ define(["./raphael.core"], function(R) {
          * Unique id of the element. Especially useful when you want to listen to events of the element,
          * because all events are fired in format `<module>.<action>.<id>`. Also useful for @Paper.getById method.
         \*/
-        this.id = R._oid++;
+        this.id = guid();
         node.raphaelid = this.id;
+
+        /**
+        * Method that returns a 5 letter/digit id, enough for 36^5 = 60466176 elements
+        * @returns {string} id
+        */
+        function guid() {
+            return ("0000" + (Math.random()*Math.pow(36,5) << 0).toString(36)).slice(-5);
+        }
+
         this.matrix = R.matrix();
         this.realPath = null;
         /*\

history.md

+2.2.2 (WIP)
+------------------
+  * Improved elements ids, so multiple raphael instances are more reliable
+
 2.2.1
 ------------------
   * Removed name of amd module

raphael.js

@@ -444,7 +444,6 @@ return /******/ (function(modules) { // webpackBootstrap
 	    \*/
 	    R.fn = paperproto = Paper.prototype = R.prototype;
 	    R._id = 0;
-	    R._oid = 0;
 	    /*\
 	     * Raphael.is
 	     [ method ]
@@ -6522,8 +6521,17 @@ return /******/ (function(modules) { // webpackBootstrap
 	         * Unique id of the element. Especially useful when you want to listen to events of the element,
 	         * because all events are fired in format `<module>.<action>.<id>`. Also useful for @Paper.getById method.
 	        \*/
-	        this.id = R._oid++;
+	        this.id = guid();
 	        node.raphaelid = this.id;
+
+	        /**
+	        * Method that returns a 5 letter/digit id, enough for 36^5 = 60466176 elements
+	        * @returns {string} id
+	        */
+	        function guid() {
+	            return ("0000" + (Math.random()*Math.pow(36,5) << 0).toString(36)).slice(-5);
+	        }
+
 	        this.matrix = R.matrix();
 	        this.realPath = null;
 	        /*\

raphael.no-deps.js

@@ -444,7 +444,6 @@ return /******/ (function(modules) { // webpackBootstrap
 	    \*/
 	    R.fn = paperproto = Paper.prototype = R.prototype;
 	    R._id = 0;
-	    R._oid = 0;
 	    /*\
 	     * Raphael.is
 	     [ method ]
@@ -6151,8 +6150,17 @@ return /******/ (function(modules) { // webpackBootstrap
 	         * Unique id of the element. Especially useful when you want to listen to events of the element,
 	         * because all events are fired in format `<module>.<action>.<id>`. Also useful for @Paper.getById method.
 	        \*/
-	        this.id = R._oid++;
+	        this.id = guid();
 	        node.raphaelid = this.id;
+
+	        /**
+	        * Method that returns a 5 letter/digit id, enough for 36^5 = 60466176 elements
+	        * @returns {string} id
+	        */
+	        function guid() {
+	            return ("0000" + (Math.random()*Math.pow(36,5) << 0).toString(36)).slice(-5);
+	        }
+
 	        this.matrix = R.matrix();
 	        this.realPath = null;
 	        /*\