Fix difference between two date times with asFloat param

lib/src/display.dart

@@ -135,7 +135,7 @@ class Display {
         break;
     }
 
-    return asFloat ? _asFloor(diff) : diff;
+    return asFloat ? diff : _asFloor(diff);
   }
 
   String _getLocaleOrdinal(Locale locale, int date) {

lib/src/jiffy.dart

@@ -819,7 +819,7 @@ class Jiffy {
   /// print('Difference in days: $diffInDays');
   /// // output: Difference in days: -14
   /// ```
-  num diff(Jiffy jiffy, {Unit unit = Unit.microsecond, bool asFloat = true}) {
+  num diff(Jiffy jiffy, {Unit unit = Unit.microsecond, bool asFloat = false}) {
     return _display.diff(dateTime, jiffy.dateTime, unit, asFloat);
   }
 

test/src/display_test.dart

@@ -156,7 +156,7 @@ void main() {
     for (var testData in diffDateTimeTestData()) {
       test('Should successfully get difference between two datetime', () {
         // Setup
-        final asFloat = true;
+        final asFloat = false;
 
         // Execute
         final actualDifference = underTest.diff(testData['firstDateTime'],
@@ -172,7 +172,7 @@ void main() {
       final firstDateTime = DateTime(2022, 12, 5);
       final secondDateTime = DateTime(2022, 12, 8);
       final unit = Unit.week;
-      final asFloat = false;
+      final asFloat = true;
 
       final expectedDifference = -0.42857142857142855;
 

test/src/jiffy_test.dart

@@ -898,7 +898,7 @@ void main() {
 
         // Execute
         final actualDifference =
-            underTest.diff(jiffyFrom, unit: Unit.month, asFloat: false);
+            underTest.diff(jiffyFrom, unit: Unit.month, asFloat: true);
 
         // Verify
         expect(actualDifference, expectedDifference);
@@ -913,7 +913,7 @@ void main() {
 
         // Execute
         final actualDifference =
-            underTest.diff(jiffyFrom, unit: Unit.month, asFloat: true);
+            underTest.diff(jiffyFrom, unit: Unit.month, asFloat: false);
 
         // Verify
         expect(actualDifference, expectedDifference);