ceil/floor/truncate/round return integers.

sdk/lib/core/int.dart

Index: sdk/lib/core/int.dart
diff --git a/sdk/lib/core/int.dart b/sdk/lib/core/int.dart
index 2262574c7dd0ebdc69e2bfe98d33a69b30b4f153..4518b7bd922fd4bb8d89f3778e82f109d17f17f9 100644
--- a/sdk/lib/core/int.dart
+++ b/sdk/lib/core/int.dart
@@ -49,10 +49,10 @@ abstract class int extends num {
   /** Returns the absolute value of this integer. */
   int abs();
 
-  /** Returns [this]. */
+  /** Returns `this`. */
   int round();
 
-  /** Returns [this]. */
+  /** Returns `this`. */
   int floor();
 
   /** Returns [this]. */
@@ -61,6 +61,18 @@ abstract class int extends num {
   /** Returns [this]. */
   int truncate();
 
+  /** Returns `this.toDouble()`. */
+  double roundToDouble();
+
+  /** Returns `this.toDouble()`. */
+  double floorToDouble();
+
+  /** Returns `this.toDouble()`. */
+  double ceilToDouble();
+
+  /** Returns `this.toDouble()`. */
+  double truncateToDouble();
+
   /**
    * Returns a representation of this [int] value.
    *