diff --git a/lib/redistat.rb b/lib/redistat.rb
index 00b8e75..11d63db 100644
--- a/lib/redistat.rb
+++ b/lib/redistat.rb
@@ -1,14 +1,20 @@
 
 require 'rubygems'
-require 'active_support'
-require 'active_support/hash_with_indifferent_access' if !{}.respond_to?(:with_indifferent_access) # Active Support 2.x and 3.x
-require 'redis'
 require 'date'
 require 'time'
-require 'time_ext'
-require 'json'
 require 'digest/sha1'
 
+# Active Support 2.x or 3.x
+require 'active_support'
+if !{}.respond_to?(:with_indifferent_access)
+  require 'active_support/core_ext/hash/indifferent_access'
+  require 'active_support/core_ext/hash/reverse_merge'
+end
+
+require 'time_ext'
+require 'redis'
+require 'json'
+
 require 'redistat/options'
 require 'redistat/connection'
 require 'redistat/database'
@@ -17,7 +23,6 @@ require 'redistat/date'
 require 'redistat/date_helper'
 require 'redistat/event'
 require 'redistat/finder'
-require 'redistat/finder/date_set'
 require 'redistat/key'
 require 'redistat/label'
 require 'redistat/model'
@@ -26,10 +31,7 @@ require 'redistat/scope'
 require 'redistat/summary'
 require 'redistat/version'
 
-require 'redistat/core_ext/date'
-require 'redistat/core_ext/time'
-require 'redistat/core_ext/fixnum'
-require 'redistat/core_ext/bignum'
+require 'redistat/core_ext'
 
 module Redistat
   
diff --git a/lib/redistat/core_ext.rb b/lib/redistat/core_ext.rb
new file mode 100644
index 0000000..f794627
--- /dev/null
+++ b/lib/redistat/core_ext.rb
@@ -0,0 +1,5 @@
+require 'redistat/core_ext/bignum'
+require 'redistat/core_ext/date'
+require 'redistat/core_ext/fixnum'
+require 'redistat/core_ext/hash'
+require 'redistat/core_ext/time'
\ No newline at end of file
diff --git a/lib/redistat/core_ext/hash.rb b/lib/redistat/core_ext/hash.rb
new file mode 100644
index 0000000..398e6e2
--- /dev/null
+++ b/lib/redistat/core_ext/hash.rb
@@ -0,0 +1,23 @@
+class Hash
+  
+  def merge_and_incr(hash)
+    self.clone.merge_and_incr!(hash)
+  end
+  
+  def merge_and_incr!(hash)
+    raise ArgumentError unless hash.is_a?(Hash)
+    hash.each do |key, value|
+      self[key] = value unless self.set_or_incr(key, value)
+    end
+    self
+  end
+  
+  def set_or_incr(key, value)
+    return false unless value.is_a?(Numeric)
+    self[key] = 0 unless self.has_key?(key)
+    return false unless self[key].is_a?(Numeric)
+    self[key] += value
+    true
+  end
+  
+end
diff --git a/lib/redistat/finder.rb b/lib/redistat/finder.rb
index 289f0ce..08fe381 100644
--- a/lib/redistat/finder.rb
+++ b/lib/redistat/finder.rb
@@ -1,3 +1,5 @@
+require 'redistat/finder/date_set'
+
 module Redistat
   class Finder
     include Database
diff --git a/lib/redistat/options.rb b/lib/redistat/options.rb
index 252b508..16632d5 100644
--- a/lib/redistat/options.rb
+++ b/lib/redistat/options.rb
@@ -5,8 +5,6 @@ module Redistat
       base.extend(ClassMethods)
     end
     
-    class InvalidDefaultOptions < ArgumentError; end
-    
     module ClassMethods
       def option_accessor(*opts)
         opts.each do |option|
diff --git a/lib/redistat/result.rb b/lib/redistat/result.rb
index 777221b..7a91dff 100644
--- a/lib/redistat/result.rb
+++ b/lib/redistat/result.rb
@@ -12,12 +12,5 @@ module Redistat
       @till = options[:till] ||= nil
     end
     
-    
-    def set_or_incr(key, value)
-      self[key] = 0 if !self.has_key?(key)
-      self[key] += value
-      self
-    end
-    
   end
-end
\ No newline at end of file
+end
diff --git a/lib/redistat/summary.rb b/lib/redistat/summary.rb
index c32bb6c..e089b5a 100644
--- a/lib/redistat/summary.rb
+++ b/lib/redistat/summary.rb
@@ -18,10 +18,10 @@ module Redistat
       
       if options[:enable_grouping]
         stats = inject_group_summaries(stats)
-        key.groups.each { |k|
+        key.groups.each do |k|
           update_key(k, stats, depth_limit, options[:connection_ref])
           k.update_index if options[:label_indexing]
-        }
+        end
       else
         update_key(key, stats, depth_limit, options[:connection_ref])
       end
@@ -43,6 +43,7 @@ module Redistat
     end
     
     def self.inject_group_summaries!(stats)
+      summaries = {}
       stats.each do |key, value|
         parts = key.to_s.split(GROUP_SEPARATOR)
         parts.pop
@@ -51,11 +52,11 @@ module Redistat
           parts.each do |part|
             sum_parts << part
             sum_key = sum_parts.join(GROUP_SEPARATOR)
-            (stats.has_key?(sum_key)) ? stats[sum_key] += value : stats[sum_key] = value
+            (summaries.has_key?(sum_key)) ? summaries[sum_key] += value : summaries[sum_key] = value
           end
         end
       end
-      stats
+      stats.merge_and_incr!(summaries)
     end
     
     def self.inject_group_summaries(stats)
diff --git a/lib/redistat/version.rb b/lib/redistat/version.rb
index b2350f8..06e8660 100644
--- a/lib/redistat/version.rb
+++ b/lib/redistat/version.rb
@@ -1,3 +1,3 @@
 module Redistat
-  VERSION = "0.2.1"
+  VERSION = "0.2.2"
 end
diff --git a/redistat.gemspec b/redistat.gemspec
index dcc62a5..fb0ee41 100644
--- a/redistat.gemspec
+++ b/redistat.gemspec
@@ -27,5 +27,4 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', '>= 2.1.0'
   s.add_development_dependency 'rcov', '>= 0.9.9'
   s.add_development_dependency 'yard', '>= 0.6.3'
-  s.add_development_dependency 'ruby-debug'
 end
diff --git a/spec/core_ext/hash_spec.rb b/spec/core_ext/hash_spec.rb
new file mode 100644
index 0000000..c838dc2
--- /dev/null
+++ b/spec/core_ext/hash_spec.rb
@@ -0,0 +1,30 @@
+require "spec_helper"
+
+describe Hash do
+  
+  it "should #set_or_incr values" do
+    hash = {:count => 1}
+    hash.set_or_incr(:sum, 3).should be_true
+    hash.should == {:count => 1, :sum => 3}
+    hash.set_or_incr(:count, 4).should be_true
+    hash.should == {:count => 5, :sum => 3}
+    hash.set_or_incr(:count, 'test').should be_false
+    hash.set_or_incr(:view, 'test').should be_false
+    hash.should == {:count => 5, :sum => 3}
+    hash[:view] = 'test'
+    hash.set_or_incr(:view, 3).should be_false
+  end
+  
+  it "should #merge_and_incr hashes" do
+    hash = { :count => 1, :city => 'hell', :sum => 3, :name => 'john' }
+    
+    new_hash = { :count => 3, :city => 'slum', :views => 2 }
+    hash.clone.merge_and_incr(new_hash).should == { :count => 4, :city => 'slum', :views => 2,
+                                                    :sum   => 3, :name => 'john' }
+    
+    new_hash = { :count => 'six', :city => 'slum', :views => 2, :time => 'late' }
+    hash.clone.merge_and_incr(new_hash).should == { :count => 'six', :city => 'slum', :views => 2,
+                                                    :sum   => 3, :name => 'john', :time => 'late' }
+  end
+  
+end
diff --git a/spec/finder_spec.rb b/spec/finder_spec.rb
index bf60a29..14e9f5c 100644
--- a/spec/finder_spec.rb
+++ b/spec/finder_spec.rb
@@ -44,8 +44,11 @@ describe Redistat::Finder do
     finder = Redistat::Finder.depth(:hour)
     finder.options[:depth].should == :hour
     
-    finder = Redistat::Finder.interval(:hour)
-    finder.options[:interval].should == :hour
+    finder = Redistat::Finder.interval(true)
+    finder.options[:interval].should be_true
+    
+    finder = Redistat::Finder.interval(false)
+    finder.options[:interval].should be_false
     
   end