Fixes #9: use Object.create(null) over {}

Author: agudulin

src/index.js

@@ -4,7 +4,7 @@
  */
 export default function mitt(all) {
 	// Arrays of event handlers, keyed by type
-	all = all || {};
+	all = all || Object.create(null);
 
 	// Get or create a named handler list
 	function list(type) {

test/index.js

@@ -14,7 +14,7 @@ describe('mitt', () => {
 		let events, inst;
 
 		beforeEach( () => {
-			events = {};
+			events = Object.create(null);
 			inst = mitt(events);
 		});
 
@@ -32,6 +32,13 @@ describe('mitt', () => {
 				expect(events).to.have.property('foo').that.deep.equals([foo]);
 			});
 
+			it('should register handlers for any type strings', () => {
+				let foo = () => {};
+				inst.on('constructor', foo);
+
+				expect(events).to.have.property('constructor').that.deep.equals([foo]);
+      });
+
 			it('should append handler for existing type', () => {
 				let foo = () => {};
 				let bar = () => {};