diff --git a/History.txt b/History.txt
index 16345a9..2d6dbd0 100644
--- a/History.txt
+++ b/History.txt
@@ -1,3 +1,8 @@
+== 0.8.5
+
+* Minor enhancements
+  * Added support for append_args and multiple prepend arguments.
+
 == 0.8.4 2011-06-15
 
 * Minor enhancements
diff --git a/README.rdoc b/README.rdoc
index 10955cd..5633eb3 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -65,6 +65,19 @@ You can look at the tests for an idea of how to declare things. If you have more
 
 http://zenadmin.org/community
 
+== TRICKS:
+
+If you define your own 'safe_method_type' resolution methods, or you define a method by providing a symbol (method executed to get type), you can use the special :prepend_args and :append_args elements in the type response. You need to provide a TypedString or an array of TypedString and these elements will be inserted in the final method. This can be used to provide default values:
+
+    safe_method_type [:parse_date, String] => :get_parse_date
+
+    def get_parse_date(signature)
+      {:class => Time, :append_args => RubyLess::TypedString.new('visitor.tz', :class => TZInfo::Timezone)}
+    end
+
+    # parse_date('2003-12-01')
+    # ==> parse_date('2003-12-01', visitor.tz)
+
 == WARNING:
 
 Changing the safe methods during runtime removes the cache for all classes and
diff --git a/lib/ruby_less/info.rb b/lib/ruby_less/info.rb
index 32b823f..9920683 100644
--- a/lib/ruby_less/info.rb
+++ b/lib/ruby_less/info.rb
@@ -1,3 +1,3 @@
 module RubyLess
-  VERSION = '0.8.4'
+  VERSION = '0.8.5'
 end
\ No newline at end of file
diff --git a/lib/ruby_less/processor.rb b/lib/ruby_less/processor.rb
index 85f9f08..7ab6233 100644
--- a/lib/ruby_less/processor.rb
+++ b/lib/ruby_less/processor.rb
@@ -400,6 +400,9 @@ def get_lit_class(lit)
 
       def args_with_prepend(args, opts)
         if prepend_args = opts[:prepend_args]
+          if prepend_args.kind_of?(Array)
+            prepend_args = array_to_arguments(prepend_args)
+          end
           if args
             prepend_args.append_argument(args)
             args = prepend_args
@@ -408,6 +411,17 @@ def args_with_prepend(args, opts)
           end
         end
 
+        if append_args = opts[:append_args]
+          if append_args.kind_of?(Array)
+            append_args = array_to_arguments(append_args)
+          end
+          if args
+            args.append_argument(append_args)
+          else
+            args = append_args
+          end
+        end
+
         if append_hash = opts[:append_hash]
           last_arg = args.list.last
           unless last_arg.klass.kind_of?(Hash)
@@ -422,5 +436,13 @@ def args_with_prepend(args, opts)
         end
         args
       end
+
+      def array_to_arguments(args)
+        code = t('')
+        args.each do |arg|
+          code.append_argument(arg)
+        end
+        code
+      end
   end
 end
diff --git a/rubyless.gemspec b/rubyless.gemspec
index 5b9c260..d801ce1 100644
--- a/rubyless.gemspec
+++ b/rubyless.gemspec
@@ -5,11 +5,11 @@
 
 Gem::Specification.new do |s|
   s.name = %q{rubyless}
-  s.version = "0.8.4"
+  s.version = "0.8.5"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Gaspard Bucher"]
-  s.date = %q{2011-06-15}
+  s.date = %q{2011-06-16}
   s.description = %q{RubyLess is an interpreter for "safe ruby". The idea is to transform some "unsafe" ruby code into safe, type checked ruby, eventually rewriting some variables or methods.}
   s.email = %q{gaspard@teti.ch}
   s.extra_rdoc_files = [
diff --git a/test/RubyLess/basic.yml b/test/RubyLess/basic.yml
index 1de0d1f..30f9971 100644
--- a/test/RubyLess/basic.yml
+++ b/test/RubyLess/basic.yml
@@ -118,10 +118,25 @@ instance_variable:
   tem: "node.mazette"
   res: "Mazette !"
 
-prepend_arg:
-  src: "prepend_test(4)"
-  tem: "add(10, 4)"
-  res: "14"
+prepend_one:
+  src: "prepend_one(4) + prepend_one"
+  tem: "(add(10, 4)+add(10))"
+  res: "24"
+
+prepend_many:
+  src: "prepend_many(4) + prepend_many"
+  tem: "(add(10, 20, 4)+add(10, 20))"
+  res: "64"
+
+append_one:
+  src: "append_one(4) + append_one"
+  tem: "(add(4, 10)+add(10))"
+  res: "24"
+
+append_many:
+  src: "append_many(4) + append_many"
+  tem: "(add(4, 10, 20)+add(10, 20))"
+  res: "64"
 
 safe_property:
   src: "dog_name"
diff --git a/test/RubyLess_test.rb b/test/RubyLess_test.rb
index 4d55eaf..6dbcad6 100644
--- a/test/RubyLess_test.rb
+++ b/test/RubyLess_test.rb
@@ -98,8 +98,14 @@ def safe_const_type(constant)
   # Example to dynamically rewrite method calls during compilation
   def safe_method_type(signature, receiver = nil)
     unless res = super
-      if signature == ['prepend_test', Number]
+      if signature == ['prepend_one'] || signature == ['prepend_one', Number]
         res ={:class => Number, :prepend_args => RubyLess::TypedString.new('10', :class => Number), :method => 'add'}
+      elsif signature == ['prepend_many'] || signature == ['prepend_many', Number]
+        res ={:class => Number, :prepend_args => [RubyLess::TypedString.new('10', :class => Number), RubyLess::TypedString.new('20', :class => Number)], :method => 'add'}
+      elsif signature == ['append_one'] || signature == ['append_one', Number]
+        res ={:class => Number, :append_args => RubyLess::TypedString.new('10', :class => Number), :method => 'add'}
+      elsif signature == ['append_many'] || signature == ['append_many', Number]
+        res ={:class => Number, :append_args => [RubyLess::TypedString.new('10', :class => Number), RubyLess::TypedString.new('20', :class => Number)], :method => 'add'}
       elsif context && res = context[:node_class].safe_method_type(signature)
         # try to execute method in the current var "var.method"
         res = res[:class].call(self, signature) if res[:class].kind_of?(Proc)
@@ -145,8 +151,8 @@ def str
     "str"
   end
 
-  def add(a,b)
-    a+b
+  def add(*args)
+    args.inject(0) {|s,a| s+a}
   end
 
   def vowel_count(str)
diff --git a/test/typed_string_test.rb b/test/typed_string_test.rb
index c87ac0e..c30abc8 100644
--- a/test/typed_string_test.rb
+++ b/test/typed_string_test.rb
@@ -11,9 +11,16 @@ class TypedStringTest < Test::Unit::TestCase
     should 'render with name' do
       assert_equal 'foo', subject.to_s
     end
-    
+
     should 'return class of content on klass' do
       assert_equal Number, subject.klass
     end
+
+    should 'maintain opts on dup' do
+      other = subject.dup
+      assert_equal TypedString, other.class
+      assert_equal subject.opts, other.opts
+      assert_equal subject.opts.object_id, other.opts.object_id
+    end
   end
 end