Updated charted DEP to 0.4.X

packages/charted/lib/core/scales.dart

 //
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 //
 
 /// Collection of scales for use by charts. The role of scales is to map the
 /// input domain to an output range.
@@ skipping 95 matching lines @@
   void rangeRoundBands(Iterable range, [double padding, double outerPadding]);
 }
 
 class RoundingFunctions extends Pair<RoundFunction, RoundFunction> {
   RoundingFunctions(RoundFunction floor, RoundFunction ceil)
       : super(floor, ceil);
 
   factory RoundingFunctions.defaults() =>
       new RoundingFunctions((x) => x.floor(), (x) => x.ceil());
 
-  factory RoundingFunctions.identity() =>
-      new RoundingFunctions(identityFunction, identityFunction);
+  factory RoundingFunctions.identity() => new RoundingFunctions(
+      (num n) => identityFunction/*<num>*/(n),
+      (num n) => identityFunction/*<num>*/(n));
 
   RoundFunction get floor => super.first;
   RoundFunction get ceil => super.last;
 }
 
 /// Namespacing container for utilities used by scales.
 abstract class ScaleUtils {
   /// Utility to return extent of sorted [values].
   static Extent extent(Iterable values) => values.first < values.last
       ? new Extent(values.first, values.last)
@@ skipping 93 matching lines @@
         hi = mid;
       } else {
         lo = mid + 1;
       }
     }
     return lo;
   }
 
   static Function bisect = bisectRight;
 }