diff --git a/lib/discrepances.js b/lib/discrepances.js
index 4535df0..6050f60 100644
--- a/lib/discrepances.js
+++ b/lib/discrepances.js
@@ -26,12 +26,22 @@
 var discrepances = {};
 /*jshint +W004 */
 
-discrepances = function discrepances(obj, def){
-    var rta='';
-    if(def && def.typeof && typeof obj !== def.typeof){
-        rta+='typeof '+JSON.stringify(obj)+' !== '+JSON.stringify(def.typeof);
+discrepances = function discrepances(a, b){
+    if(a === b){
+        return null;
     }
-    return rta || null;
+    var typeA = typeof a;
+    var typeB = typeof b;
+    if(typeA === typeB) {
+        if(typeA === 'number') {
+            return {difference:a-b, values:[a,b]};
+        }
+    }
+    // var rta='';
+    // if(def && def.typeof && typeof obj !== def.typeof){
+    //    rta+='typeof '+JSON.stringify(obj)+' !== '+JSON.stringify(def.typeof);
+    // }
+    // return rta || null;
 }
 
 return discrepances;
diff --git a/test/test.js b/test/test.js
index c7e2ce1..a17b228 100644
--- a/test/test.js
+++ b/test/test.js
@@ -7,7 +7,7 @@ var discrepances = require('../lib/discrepances.js');
 describe("discrepances", function(){
     [
         {a:4                 , b:4                  , expected: null                                                                      },
-        {skip:true, a:4                 , b:5                  , expected: {difference:-1             , values:[4, 5]                               }},
+        {a:4                 , b:5                  , expected: {difference:-1             , values:[4, 5]                               }},
         {skip:true, a:"4"               , b:4                  , expected: {types:['string', 'number'], values:["4", 4]                             }},
         {skip:true, a:null              , b:0                  , expected: {types:['null'  , 'number'], values:[null, 0]                            }},
         {skip:true, a:new Date()        , b:/a/                , expected: {class:['Date'  , 'RegExp'], values:[new Date(), /a/]                    }},
@@ -17,13 +17,14 @@ describe("discrepances", function(){
         {skip:true, a:{x:1, y:2, z:[3]} , b:{x:1, y:2, z:[3]}  , expected: null                                                                      },
     ].forEach(function(fixture){
         if(fixture.skip) {
+            delete fixture.skip;
             it('skipped fixture: '+JSON.stringify(fixture));
             return true;
         }
-        it("controls discrepances via fixture: "+JSON.stringify(fixture), function(){
+        it("fixture: "+JSON.stringify(fixture), function(){
             expect(discrepances(fixture.a, fixture.b)).to.eql(fixture.expected);
-            expect(JSON.stringify(discrepances(fixture.a, fixture.structure))).to.eql(JSON.stringify(fixture.expected));
-            expect(JSON4all.stringify(discrepances(fixture.a, fixture.structure))).to.eql(JSON4all.stringify(fixture.expected));
+            expect(JSON.stringify(discrepances(fixture.a, fixture.b))).to.eql(JSON.stringify(fixture.expected));
+            expect(JSON4all.stringify(discrepances(fixture.a, fixture.b))).to.eql(JSON4all.stringify(fixture.expected));
         });
     });
 });
\ No newline at end of file