diff --git a/lib/mongo/collection.rb b/lib/mongo/collection.rb
index 03375a0..654acec 100644
--- a/lib/mongo/collection.rb
+++ b/lib/mongo/collection.rb
@@ -453,8 +453,10 @@ module Mongo
       end
 
       # only add finalize if specified
-      if finalize
-        finalize = Code.new(finalize) unless finalize.is_a?(Code)
+      # check to see if users have sent the finalizer as the last argument.
+      finalize = deprecated if deprecated.is_a?(String) || deprecated.is_a?(Code)
+      finalize = Code.new(finalize) if finalize.is_a?(String)
+      if finalize.is_a?(Code)
         group_command['group']['finalize'] = finalize
       end
 
diff --git a/test/db_api_test.rb b/test/db_api_test.rb
index 44ac825..bbff146 100644
--- a/test/db_api_test.rb
+++ b/test/db_api_test.rb
@@ -539,22 +539,19 @@ class DBAPITest < Test::Unit::TestCase
     test = @@db.collection("test")
 
     assert_equal [], test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }")
-    assert_equal [], test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }", true)
+    assert_equal [], test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }")
 
     test.insert("a" => 2)
     test.insert("b" => 5)
     test.insert("a" => 1)
 
     assert_equal 3, test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }")[0]["count"]
-    assert_equal 3, test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }", true)[0]["count"]
+    assert_equal 3, test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }")[0]["count"]
+    assert_equal 1, test.group([], {"a" => {"$gt" => 1}}, {"count" => 0}, "function (obj, prev) { prev.count++; }")[0]["count"]
     assert_equal 1, test.group([], {"a" => {"$gt" => 1}}, {"count" => 0}, "function (obj, prev) { prev.count++; }")[0]["count"]
-    assert_equal 1, test.group([], {"a" => {"$gt" => 1}}, {"count" => 0}, "function (obj, prev) { prev.count++; }", true)[0]["count"]
 
     finalize = "function (obj) { obj.f = obj.count - 1; }"
     assert_equal 2, test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }", true, finalize)[0]["f"]
-    assert_raise OperationFailure do
-      test.group([], {}, {"count" => 0}, "function (obj, prev) { prev.count++; }", false, finalize)[0]["f"]
-    end
 
     test.insert("a" => 2, "b" => 3)
     expected = [{"a" => 2, "count" => 2},
diff --git a/test/objectid_test.rb b/test/objectid_test.rb
index 3156937..76afa98 100644
--- a/test/objectid_test.rb
+++ b/test/objectid_test.rb
@@ -48,15 +48,6 @@ class ObjectIDTest < Test::Unit::TestCase
     assert_equal 24, $1.length
   end
 
-  def test_to_s_legacy
-    s = @o.to_s_legacy
-    assert_equal 24, s.length
-    s =~ /^([0-9a-f]+)$/
-    assert_equal 24, $1.length
-
-    assert_not_equal s, @o.to_s
-  end
-
   def test_save_and_restore
     host = ENV['MONGO_RUBY_DRIVER_HOST'] || 'localhost'
     port = ENV['MONGO_RUBY_DRIVER_PORT'] || Connection::DEFAULT_PORT
@@ -85,20 +76,6 @@ class ObjectIDTest < Test::Unit::TestCase
     end
   end
 
-  def test_from_string_legacy
-    hex_str = @o.to_s_legacy
-    o2 = ObjectID.from_string_legacy(hex_str)
-    assert_equal hex_str, o2.to_s_legacy
-    assert_equal @o, o2
-    assert_equal @o.to_s, o2.to_s
-  end
-
-  def test_illegal_from_string_legacy
-    assert_raise InvalidObjectID do 
-      ObjectID.from_string_legacy("")
-    end
-  end
-
   def test_legal
     assert !ObjectID.legal?(nil)
     assert !ObjectID.legal?("fred")
@@ -121,18 +98,6 @@ class ObjectIDTest < Test::Unit::TestCase
     assert_equal [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b], o.to_a
   end
 
-  def test_legacy_byte_order
-    hex_str = '000102030405060708090A0B'
-    o = ObjectID.from_string_legacy(hex_str)
-    assert_equal [0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00, 0x0b, 0x0a, 0x09, 0x08], o.to_a
-  end
-
-  def test_legacy_string_convert
-    l = @o.to_s_legacy
-    s = @o.to_s
-    assert_equal s, ObjectID.legacy_string_convert(l)
-  end
-
   def test_generation_time
     time = Time.now
     id   = ObjectID.new