fix numbers

src/ShallowWrapper.js

@@ -202,13 +202,7 @@ export default class ShallowWrapper {
    * @returns {Boolean}
    */
   contains(node) {
-    let nodeToCompare = node;
-
-    if (typeof nodeToCompare === 'number') {
-      nodeToCompare = '' + nodeToCompare;
-    }
-
-    return findWhereUnwrapped(this, other => nodeEqual(nodeToCompare, other)).length > 0;
+    return findWhereUnwrapped(this, other => nodeEqual(node, other)).length > 0;
   }
 
   /**

src/Utils.js

@@ -82,7 +82,7 @@ export function nodeEqual(a, b) {
     }
   }
 
-  if (typeof a !== 'string') {
+  if (typeof a !== 'string' && typeof a !== 'number') {
     return leftKeys.length === Object.keys(right).length;
   }
 

src/__tests__/ShallowWrapper-spec.js

@@ -91,10 +91,11 @@ describe('shallow', () => {
     });
 
     it('should work with numbers', () => {
-      const wrapper = shallow(<div>1</div>);
+      const wrapper = shallow(<div>{1}</div>);
 
       expect(wrapper.contains(1)).to.equal(true);
       expect(wrapper.contains(2)).to.equal(false);
+      expect(wrapper.contains('1')).to.equal(false);
     });
 
   });