diff --git a/lib/edn.rb b/lib/edn.rb
index 5149d98..8d4500e 100644
--- a/lib/edn.rb
+++ b/lib/edn.rb
@@ -61,8 +61,12 @@ def self.set(*elems)
     Set.new(*elems)
   end
 
+  def self.rational(value)
+    Rational(value)
+  end
+  
   def self.big_decimal(str)
-    BigDecimal.new(str)
+    BigDecimal(str)
   end
 end
 
diff --git a/lib/edn/core_ext.rb b/lib/edn/core_ext.rb
index 316ce2c..8d04cb2 100644
--- a/lib/edn/core_ext.rb
+++ b/lib/edn/core_ext.rb
@@ -16,9 +16,9 @@ def allows_metadata?
       end
     end
 
-    module Bignum
+    module Integer
       def to_edn
-        self.to_s + 'M'
+        self.to_s + 'N'
       end
     end
 
@@ -94,7 +94,7 @@ def to_edn
 end
 
 Numeric.send(:include, EDN::CoreExt::Unquoted)
-Bignum.send(:include, EDN::CoreExt::Bignum)
+Integer.send(:include, EDN::CoreExt::Integer)
 BigDecimal.send(:include, EDN::CoreExt::BigDecimal)
 TrueClass.send(:include, EDN::CoreExt::Unquoted)
 FalseClass.send(:include, EDN::CoreExt::Unquoted)
diff --git a/lib/edn/version.rb b/lib/edn/version.rb
index 5c9d1c8..982597e 100644
--- a/lib/edn/version.rb
+++ b/lib/edn/version.rb
@@ -1,3 +1,3 @@
 module EDN
-  VERSION = "1.1.1"
+  VERSION = "1.1.2"
 end