fix #155, numeric integer literals

lib/src/js/nodes.dart

Index: lib/src/js/nodes.dart
diff --git a/lib/src/js/nodes.dart b/lib/src/js/nodes.dart
index 808ff3cdbf7a9447ca1b9454512f78a1ee621b57..ac6f7cd134a7c678d4e1aa3e5349f6b1d7e10a1e 100644
--- a/lib/src/js/nodes.dart
+++ b/lib/src/js/nodes.dart
@@ -1091,6 +1091,12 @@ class LiteralNumber extends Literal {
 
   accept(NodeVisitor visitor) => visitor.visitLiteralNumber(this);
   LiteralNumber _clone() => new LiteralNumber(value);
+
+  /**
+   * Make sure to generate `(1).toString()` and `1.0.toString()`. In other

[Jacob, 2015/04/23 20:18:54]

comment text is a bit awkward. Instead of "Make sure to generate"
perhaps
Use a different precedence level depending on whether the value contains a dot
to ensure we generate `(1).toString()` and `1.0.toString()`.

[Jennifer Messerly, 2015/04/23 20:38:51]

Done.

+   * words, we pretend to have a difference precedence if a dot is present
+   */
+  int get precedenceLevel => value.contains('.') ? PRIMARY : UNARY;
 }
 
 class ArrayInitializer extends Expression {