Simplified rounding code in toBeCloseTo

Signed-off-by: Steve Gravrock <sgravrock@pivotal.io>

lib/jasmine-core/jasmine.js

@@ -2795,8 +2795,11 @@ getJasmineRequireObj().toBeCloseTo = function() {
         }
 
         var pow = Math.pow(10, precision + 1);
+        var delta = Math.abs(expected - actual);
+        var maxDelta = Math.pow(10, -precision) / 2;
+
         return {
-          pass: +(Math.round(Math.abs(expected - actual) * pow) / pow).toFixed(precision + 1) <= (Math.pow(10, -precision) / 2)
+          pass: Math.round(delta * pow) / pow <= maxDelta
         };
       }
     };

src/core/matchers/toBeCloseTo.js

@@ -22,8 +22,11 @@ getJasmineRequireObj().toBeCloseTo = function() {
         }
 
         var pow = Math.pow(10, precision + 1);
+        var delta = Math.abs(expected - actual);
+        var maxDelta = Math.pow(10, -precision) / 2;
+
         return {
-          pass: +(Math.round(Math.abs(expected - actual) * pow) / pow).toFixed(precision + 1) <= (Math.pow(10, -precision) / 2)
+          pass: Math.round(delta * pow) / pow <= maxDelta
         };
       }
     };