diff --git a/activesupport/lib/active_support/base64.rb b/activesupport/lib/active_support/base64.rb
index acb8e5a967f4b..b8c01628ceeb1 100644
--- a/activesupport/lib/active_support/base64.rb
+++ b/activesupport/lib/active_support/base64.rb
@@ -30,4 +30,13 @@ def self.decode64(data)
       end
     end
   end
+
+  # Encodes the value as base64 without the newline breaks. This makes the base64 encoding readily usable as URL parameters
+  # or memcache keys without further processing.
+  #
+  #  ActiveSupport::Base64.encode64s("Original unencoded string")
+  #  # => "T3JpZ2luYWwgdW5lbmNvZGVkIHN0cmluZw=="
+  def Base64.encode64s(value)
+    encode64(value).gsub(/\n/, '')
+  end
 end
diff --git a/activesupport/lib/active_support/core_ext.rb b/activesupport/lib/active_support/core_ext.rb
index f2f976df9b1fa..d9b7a5b05846b 100644
--- a/activesupport/lib/active_support/core_ext.rb
+++ b/activesupport/lib/active_support/core_ext.rb
@@ -1,4 +1,4 @@
-Dir[File.dirname(__FILE__) + "/core_ext/*.rb"].sort.each do |path|
-  filename = File.basename(path, '.rb')
-  require "active_support/core_ext/#{filename}"
+require 'active_support/core_ext/util'
+Dir["#{File.dirname(__FILE__)}/core_ext/*.rb"].sort.each do |path|
+  require "active_support/core_ext/#{File.basename(path, '.rb')}"
 end
diff --git a/activesupport/lib/active_support/core_ext/array.rb b/activesupport/lib/active_support/core_ext/array.rb
index 82c6b1243a6f8..56e7b377151dd 100644
--- a/activesupport/lib/active_support/core_ext/array.rb
+++ b/activesupport/lib/active_support/core_ext/array.rb
@@ -1,15 +1,3 @@
-require 'active_support/core_ext/array/access'
-require 'active_support/core_ext/array/conversions'
-require 'active_support/core_ext/array/extract_options'
-require 'active_support/core_ext/array/grouping'
-require 'active_support/core_ext/array/random_access'
-require 'active_support/core_ext/array/wrapper'
-
-class Array #:nodoc:
-  include ActiveSupport::CoreExtensions::Array::Access
-  include ActiveSupport::CoreExtensions::Array::Conversions
-  include ActiveSupport::CoreExtensions::Array::ExtractOptions
-  include ActiveSupport::CoreExtensions::Array::Grouping
-  include ActiveSupport::CoreExtensions::Array::RandomAccess
-  extend ActiveSupport::CoreExtensions::Array::Wrapper
-end
+require 'active_support/core_ext/util'
+require 'active_support/core_ext/array/wrap'
+ActiveSupport.core_ext Array, %w(access conversions extract_options grouping random_access)
diff --git a/activesupport/lib/active_support/core_ext/array/wrap.rb b/activesupport/lib/active_support/core_ext/array/wrap.rb
new file mode 100644
index 0000000000000..9d45c2739b466
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/array/wrap.rb
@@ -0,0 +1,18 @@
+class Array
+  # Wraps the object in an Array unless it's an Array.  Converts the
+  # object to an Array using #to_ary if it implements that.
+  def self.wrap(object)
+    case object
+    when nil
+      []
+    when self
+      object
+    else
+      if object.respond_to?(:to_ary)
+        object.to_ary
+      else
+        [object]
+      end
+    end
+  end
+end
diff --git a/activesupport/lib/active_support/core_ext/array/wrapper.rb b/activesupport/lib/active_support/core_ext/array/wrapper.rb
deleted file mode 100644
index 80b8f05531633..0000000000000
--- a/activesupport/lib/active_support/core_ext/array/wrapper.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module Array #:nodoc:
-      module Wrapper
-        # Wraps the object in an Array unless it's an Array.  Converts the
-        # object to an Array using #to_ary if it implements that.
-        def wrap(object)
-          case object
-          when nil
-            []
-          when self
-            object
-          else
-            if object.respond_to?(:to_ary)
-              object.to_ary
-            else
-              [object]
-            end
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/activesupport/lib/active_support/core_ext/base64.rb b/activesupport/lib/active_support/core_ext/base64.rb
deleted file mode 100644
index 235e2edf57723..0000000000000
--- a/activesupport/lib/active_support/core_ext/base64.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-require 'active_support/base64'
-require 'active_support/core_ext/base64/encoding'
-
-ActiveSupport::Base64.extend ActiveSupport::CoreExtensions::Base64::Encoding
diff --git a/activesupport/lib/active_support/core_ext/base64/encoding.rb b/activesupport/lib/active_support/core_ext/base64/encoding.rb
deleted file mode 100644
index a9656c138e5bd..0000000000000
--- a/activesupport/lib/active_support/core_ext/base64/encoding.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module Base64 #:nodoc:
-      module Encoding
-        # Encodes the value as base64 without the newline breaks. This makes the base64 encoding readily usable as URL parameters 
-        # or memcache keys without further processing.
-        #
-        #  ActiveSupport::Base64.encode64s("Original unencoded string") 
-        #  # => "T3JpZ2luYWwgdW5lbmNvZGVkIHN0cmluZw=="
-        def encode64s(value)
-          encode64(value).gsub(/\n/, '')
-        end
-      end
-    end
-  end
-end
diff --git a/activesupport/lib/active_support/core_ext/big_decimal.rb b/activesupport/lib/active_support/core_ext/big_decimal.rb
new file mode 100644
index 0000000000000..d49587d8612c1
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/big_decimal.rb
@@ -0,0 +1,3 @@
+require 'active_support/core_ext/util'
+require 'bigdecimal'
+ActiveSupport.core_ext BigDecimal, %w(conversions)
diff --git a/activesupport/lib/active_support/core_ext/bigdecimal/conversions.rb b/activesupport/lib/active_support/core_ext/big_decimal/conversions.rb
similarity index 100%
rename from activesupport/lib/active_support/core_ext/bigdecimal/conversions.rb
rename to activesupport/lib/active_support/core_ext/big_decimal/conversions.rb
diff --git a/activesupport/lib/active_support/core_ext/bigdecimal.rb b/activesupport/lib/active_support/core_ext/bigdecimal.rb
deleted file mode 100644
index d429078c9149e..0000000000000
--- a/activesupport/lib/active_support/core_ext/bigdecimal.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-require 'bigdecimal'
-require 'active_support/core_ext/bigdecimal/conversions'
-
-class BigDecimal#:nodoc:
-  include ActiveSupport::CoreExtensions::BigDecimal::Conversions
-end
diff --git a/activesupport/lib/active_support/core_ext/cgi.rb b/activesupport/lib/active_support/core_ext/cgi.rb
index db90e5c74598a..7279a3d4da2b8 100644
--- a/activesupport/lib/active_support/core_ext/cgi.rb
+++ b/activesupport/lib/active_support/core_ext/cgi.rb
@@ -1,5 +1 @@
 require 'active_support/core_ext/cgi/escape_skipping_slashes'
-
-class CGI #:nodoc:
-  extend ActiveSupport::CoreExtensions::CGI::EscapeSkippingSlashes
-end
diff --git a/activesupport/lib/active_support/core_ext/cgi/escape_skipping_slashes.rb b/activesupport/lib/active_support/core_ext/cgi/escape_skipping_slashes.rb
index 1edb3771a26be..1c3ef0552615d 100644
--- a/activesupport/lib/active_support/core_ext/cgi/escape_skipping_slashes.rb
+++ b/activesupport/lib/active_support/core_ext/cgi/escape_skipping_slashes.rb
@@ -1,23 +1,17 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module CGI #:nodoc:
-      module EscapeSkippingSlashes #:nodoc:
-        if RUBY_VERSION >= '1.9'
-          def escape_skipping_slashes(str)
-            str = str.join('/') if str.respond_to? :join
-            str.gsub(/([^ \/a-zA-Z0-9_.-])/n) do
-              "%#{$1.unpack('H2' * $1.bytesize).join('%').upcase}"
-            end.tr(' ', '+')
-          end
-        else
-          def escape_skipping_slashes(str)
-            str = str.join('/') if str.respond_to? :join
-            str.gsub(/([^ \/a-zA-Z0-9_.-])/n) do
-              "%#{$1.unpack('H2').first.upcase}"
-            end.tr(' ', '+')
-          end
-        end
-      end
+class CGI #:nodoc:
+  if RUBY_VERSION >= '1.9'
+    def self.escape_skipping_slashes(str)
+      str = str.join('/') if str.respond_to? :join
+      str.gsub(/([^ \/a-zA-Z0-9_.-])/n) do
+        "%#{$1.unpack('H2' * $1.bytesize).join('%').upcase}"
+      end.tr(' ', '+')
+    end
+  else
+    def self.escape_skipping_slashes(str)
+      str = str.join('/') if str.respond_to? :join
+      str.gsub(/([^ \/a-zA-Z0-9_.-])/n) do
+        "%#{$1.unpack('H2').first.upcase}"
+      end.tr(' ', '+')
     end
   end
 end
diff --git a/activesupport/lib/active_support/core_ext/date.rb b/activesupport/lib/active_support/core_ext/date.rb
index 3f56c560b6d1d..f3b71e54af50f 100644
--- a/activesupport/lib/active_support/core_ext/date.rb
+++ b/activesupport/lib/active_support/core_ext/date.rb
@@ -1,10 +1,3 @@
+require 'active_support/core_ext/util'
 require 'date'
-require 'active_support/core_ext/date/behavior'
-require 'active_support/core_ext/date/calculations'
-require 'active_support/core_ext/date/conversions'
-
-class Date#:nodoc:
-  include ActiveSupport::CoreExtensions::Date::Behavior
-  include ActiveSupport::CoreExtensions::Date::Calculations
-  include ActiveSupport::CoreExtensions::Date::Conversions
-end
+ActiveSupport.core_ext Date, %w(behavior calculations conversions)
diff --git a/activesupport/lib/active_support/core_ext/date_time.rb b/activesupport/lib/active_support/core_ext/date_time.rb
index 66a93eac43444..fd979a267e5b2 100644
--- a/activesupport/lib/active_support/core_ext/date_time.rb
+++ b/activesupport/lib/active_support/core_ext/date_time.rb
@@ -1,12 +1,11 @@
+require 'active_support/core_ext/util'
 require 'date'
 require 'active_support/core_ext/time/behavior'
 require 'active_support/core_ext/time/zones'
-require 'active_support/core_ext/date_time/calculations'
-require 'active_support/core_ext/date_time/conversions'
 
 class DateTime
   include ActiveSupport::CoreExtensions::Time::Behavior
   include ActiveSupport::CoreExtensions::Time::Zones
-  include ActiveSupport::CoreExtensions::DateTime::Calculations
-  include ActiveSupport::CoreExtensions::DateTime::Conversions
 end
+
+ActiveSupport.core_ext DateTime, %w(calculations conversions)
diff --git a/activesupport/lib/active_support/core_ext/exception.rb b/activesupport/lib/active_support/core_ext/exception.rb
index cde0df4153947..c22013beef691 100644
--- a/activesupport/lib/active_support/core_ext/exception.rb
+++ b/activesupport/lib/active_support/core_ext/exception.rb
@@ -1,9 +1,5 @@
 module ActiveSupport
-  if RUBY_VERSION >= '1.9'
-    FrozenObjectError = RuntimeError
-  else
-    FrozenObjectError = TypeError
-  end
+  FrozenObjectError = RUBY_VERSION < '1.9' ? TypeError : RuntimeError
 end
 
 # TODO: Turn all this into using the BacktraceCleaner.
diff --git a/activesupport/lib/active_support/core_ext/file.rb b/activesupport/lib/active_support/core_ext/file.rb
index e03f8ac44eaf0..dc24afbe7f811 100644
--- a/activesupport/lib/active_support/core_ext/file.rb
+++ b/activesupport/lib/active_support/core_ext/file.rb
@@ -1,5 +1 @@
 require 'active_support/core_ext/file/atomic'
-
-class File #:nodoc:
-  extend ActiveSupport::CoreExtensions::File::Atomic
-end
diff --git a/activesupport/lib/active_support/core_ext/file/atomic.rb b/activesupport/lib/active_support/core_ext/file/atomic.rb
index 8cc5654a4bf38..249fb1362d021 100644
--- a/activesupport/lib/active_support/core_ext/file/atomic.rb
+++ b/activesupport/lib/active_support/core_ext/file/atomic.rb
@@ -1,46 +1,40 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module File #:nodoc:
-      module Atomic
-        # Write to a file atomically.  Useful for situations where you don't
-        # want other processes or threads to see half-written files.
-        #
-        #   File.atomic_write("important.file") do |file|
-        #     file.write("hello")
-        #   end
-        #
-        # If your temp directory is not on the same filesystem as the file you're 
-        # trying to write, you can provide a different temporary directory.
-        # 
-        #   File.atomic_write("/data/something.important", "/data/tmp") do |f|
-        #     file.write("hello")
-        #   end
-        def atomic_write(file_name, temp_dir = Dir.tmpdir)
-          require 'tempfile' unless defined?(Tempfile)
+class File
+  # Write to a file atomically.  Useful for situations where you don't
+  # want other processes or threads to see half-written files.
+  #
+  #   File.atomic_write("important.file") do |file|
+  #     file.write("hello")
+  #   end
+  #
+  # If your temp directory is not on the same filesystem as the file you're
+  # trying to write, you can provide a different temporary directory.
+  #
+  #   File.atomic_write("/data/something.important", "/data/tmp") do |f|
+  #     file.write("hello")
+  #   end
+  def self.atomic_write(file_name, temp_dir = Dir.tmpdir)
+    require 'tempfile' unless defined?(Tempfile)
 
-          temp_file = Tempfile.new(basename(file_name), temp_dir)
-          yield temp_file
-          temp_file.close
+    temp_file = Tempfile.new(basename(file_name), temp_dir)
+    yield temp_file
+    temp_file.close
 
-          begin
-            # Get original file permissions
-            old_stat = stat(file_name)
-          rescue Errno::ENOENT
-            # No old permissions, write a temp file to determine the defaults
-            check_name = join(dirname(file_name), ".permissions_check.#{Thread.current.object_id}.#{Process.pid}.#{rand(1000000)}")
-            open(check_name, "w") { }
-            old_stat = stat(check_name)
-            unlink(check_name)
-          end
+    begin
+      # Get original file permissions
+      old_stat = stat(file_name)
+    rescue Errno::ENOENT
+      # No old permissions, write a temp file to determine the defaults
+      check_name = join(dirname(file_name), ".permissions_check.#{Thread.current.object_id}.#{Process.pid}.#{rand(1000000)}")
+      open(check_name, "w") { }
+      old_stat = stat(check_name)
+      unlink(check_name)
+    end
 
-          # Overwrite original file with temp file
-          rename(temp_file.path, file_name)
+    # Overwrite original file with temp file
+    rename(temp_file.path, file_name)
 
-          # Set correct permissions on new file
-          chown(old_stat.uid, old_stat.gid, file_name)
-          chmod(old_stat.mode, file_name)
-        end
-      end
-    end
+    # Set correct permissions on new file
+    chown(old_stat.uid, old_stat.gid, file_name)
+    chmod(old_stat.mode, file_name)
   end
 end
diff --git a/activesupport/lib/active_support/core_ext/float.rb b/activesupport/lib/active_support/core_ext/float.rb
index af166aa610ff6..7570471b95f91 100644
--- a/activesupport/lib/active_support/core_ext/float.rb
+++ b/activesupport/lib/active_support/core_ext/float.rb
@@ -1,7 +1 @@
 require 'active_support/core_ext/float/rounding'
-require 'active_support/core_ext/float/time'
-
-class Float #:nodoc:
-  include ActiveSupport::CoreExtensions::Float::Rounding
-  include ActiveSupport::CoreExtensions::Float::Time
-end
diff --git a/activesupport/lib/active_support/core_ext/float/rounding.rb b/activesupport/lib/active_support/core_ext/float/rounding.rb
index 062d466838348..0b1ae4be7e999 100644
--- a/activesupport/lib/active_support/core_ext/float/rounding.rb
+++ b/activesupport/lib/active_support/core_ext/float/rounding.rb
@@ -1,24 +1,18 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module Float #:nodoc:
-      module Rounding
-        def self.included(base) #:nodoc:
-          base.class_eval do
-            alias_method :round_without_precision, :round
-            alias_method :round, :round_with_precision
-          end
-        end
+class Float
+  remove_method :round
 
-        # Rounds the float with the specified precision.
-        #
-        #   x = 1.337
-        #   x.round    # => 1
-        #   x.round(1) # => 1.3
-        #   x.round(2) # => 1.34
-        def round_with_precision(precision = nil)
-          precision.nil? ? round_without_precision : (self * (10 ** precision)).round / (10 ** precision).to_f
-        end
-      end
+  # Rounds the float with the specified precision.
+  #
+  #   x = 1.337
+  #   x.round    # => 1
+  #   x.round(1) # => 1.3
+  #   x.round(2) # => 1.34
+  def round(precision = nil)
+    if precision
+      magnitude = 10.0 ** precision
+      (self * magnitude).round / magnitude
+    else
+      super()
     end
   end
 end
diff --git a/activesupport/lib/active_support/core_ext/float/time.rb b/activesupport/lib/active_support/core_ext/float/time.rb
deleted file mode 100644
index 13f2e0ddcab22..0000000000000
--- a/activesupport/lib/active_support/core_ext/float/time.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module Float #:nodoc:
-      module Time
-        # Deprication helper methods not available as core_ext is loaded first.
-        def years
-          ::ActiveSupport::Deprecation.warn(self.class.deprecated_method_warning(:years, "Fractional years are not respected. Convert value to integer before calling #years."), caller)
-          years_without_deprecation
-        end
-        def months
-          ::ActiveSupport::Deprecation.warn(self.class.deprecated_method_warning(:months, "Fractional months are not respected. Convert value to integer before calling #months."), caller)
-          months_without_deprecation
-        end
-
-        def months_without_deprecation
-          ActiveSupport::Duration.new(self * 30.days, [[:months, self]])
-        end
-        alias :month :months
-      
-        def years_without_deprecation
-          ActiveSupport::Duration.new(self * 365.25.days, [[:years, self]])
-        end
-        alias :year :years
-      end
-    end
-  end
-end
\ No newline at end of file
diff --git a/activesupport/lib/active_support/core_ext/hash.rb b/activesupport/lib/active_support/core_ext/hash.rb
index a6065ab48e27c..d940812d3478c 100644
--- a/activesupport/lib/active_support/core_ext/hash.rb
+++ b/activesupport/lib/active_support/core_ext/hash.rb
@@ -1,14 +1,2 @@
-%w(keys indifferent_access deep_merge reverse_merge conversions diff slice except).each do |ext|
-  require "active_support/core_ext/hash/#{ext}"
-end
-
-class Hash #:nodoc:
-  include ActiveSupport::CoreExtensions::Hash::Keys
-  include ActiveSupport::CoreExtensions::Hash::IndifferentAccess
-  include ActiveSupport::CoreExtensions::Hash::DeepMerge
-  include ActiveSupport::CoreExtensions::Hash::ReverseMerge
-  include ActiveSupport::CoreExtensions::Hash::Conversions
-  include ActiveSupport::CoreExtensions::Hash::Diff
-  include ActiveSupport::CoreExtensions::Hash::Slice
-  include ActiveSupport::CoreExtensions::Hash::Except
-end
+require 'active_support/core_ext/util'
+ActiveSupport.core_ext Hash, %w(keys indifferent_access deep_merge reverse_merge conversions diff slice except)
diff --git a/activesupport/lib/active_support/core_ext/integer.rb b/activesupport/lib/active_support/core_ext/integer.rb
index 18a7a402db007..dc332db3ba9f3 100644
--- a/activesupport/lib/active_support/core_ext/integer.rb
+++ b/activesupport/lib/active_support/core_ext/integer.rb
@@ -1,9 +1,2 @@
-require 'active_support/core_ext/integer/even_odd'
-require 'active_support/core_ext/integer/inflections'
-require 'active_support/core_ext/integer/time'
-
-class Integer #:nodoc:
-  include ActiveSupport::CoreExtensions::Integer::EvenOdd
-  include ActiveSupport::CoreExtensions::Integer::Inflections
-  include ActiveSupport::CoreExtensions::Integer::Time
-end
+require 'active_support/core_ext/util'
+ActiveSupport.core_ext Integer, %w(even_odd inflections time)
diff --git a/activesupport/lib/active_support/core_ext/numeric.rb b/activesupport/lib/active_support/core_ext/numeric.rb
index 759b86b81d08f..33bd625fef90a 100644
--- a/activesupport/lib/active_support/core_ext/numeric.rb
+++ b/activesupport/lib/active_support/core_ext/numeric.rb
@@ -1,9 +1,2 @@
-require 'active_support/core_ext/numeric/time'
-require 'active_support/core_ext/numeric/bytes'
-require 'active_support/core_ext/numeric/conversions'
-
-class Numeric #:nodoc:
-  include ActiveSupport::CoreExtensions::Numeric::Time 
-  include ActiveSupport::CoreExtensions::Numeric::Bytes
-  include ActiveSupport::CoreExtensions::Numeric::Conversions 
-end
+require 'active_support/core_ext/util'
+ActiveSupport.core_ext Numeric, %w(time bytes conversions)
diff --git a/activesupport/lib/active_support/core_ext/pathname.rb b/activesupport/lib/active_support/core_ext/pathname.rb
index 4c5318ee63ee6..517c3b972b2f0 100644
--- a/activesupport/lib/active_support/core_ext/pathname.rb
+++ b/activesupport/lib/active_support/core_ext/pathname.rb
@@ -1,7 +1 @@
-require 'pathname'
 require 'active_support/core_ext/pathname/clean_within'
-
-class Pathname#:nodoc:
-  extend ActiveSupport::CoreExtensions::Pathname::CleanWithin
-end
-
diff --git a/activesupport/lib/active_support/core_ext/pathname/clean_within.rb b/activesupport/lib/active_support/core_ext/pathname/clean_within.rb
index ae03e1bc5a94d..89690252b15d3 100644
--- a/activesupport/lib/active_support/core_ext/pathname/clean_within.rb
+++ b/activesupport/lib/active_support/core_ext/pathname/clean_within.rb
@@ -1,14 +1,10 @@
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module Pathname #:nodoc:
-      module CleanWithin
-        # Clean the paths contained in the provided string.
-        def clean_within(string)
-          string.gsub(%r{[\w. ]+(/[\w. ]+)+(\.rb)?(\b|$)}) do |path|
-            new(path).cleanpath
-          end
-        end
-      end
+require 'pathname'
+
+class Pathname
+  # Clean the paths contained in the provided string.
+  def self.clean_within(string)
+    string.gsub(%r{[\w. ]+(/[\w. ]+)+(\.rb)?(\b|$)}) do |path|
+      new(path).cleanpath
     end
   end
 end
diff --git a/activesupport/lib/active_support/core_ext/process/daemon.rb b/activesupport/lib/active_support/core_ext/process/daemon.rb
index 95ad5f8a5d045..f5202ddee4114 100644
--- a/activesupport/lib/active_support/core_ext/process/daemon.rb
+++ b/activesupport/lib/active_support/core_ext/process/daemon.rb
@@ -1,25 +1,23 @@
-if RUBY_VERSION < "1.9"
-  module Process
-    def self.daemon(nochdir = nil, noclose = nil)
-      exit if fork                     # Parent exits, child continues.
-      Process.setsid                   # Become session leader.
-      exit if fork                     # Zap session leader. See [1].
+module Process
+  def self.daemon(nochdir = nil, noclose = nil)
+    exit if fork                     # Parent exits, child continues.
+    Process.setsid                   # Become session leader.
+    exit if fork                     # Zap session leader. See [1].
 
-      unless nochdir
-        Dir.chdir "/"                  # Release old working directory.
-      end
+    unless nochdir
+      Dir.chdir "/"                  # Release old working directory.
+    end
 
-      File.umask 0000                  # Ensure sensible umask. Adjust as needed.
+    File.umask 0000                  # Ensure sensible umask. Adjust as needed.
 
-      unless noclose
-        STDIN.reopen "/dev/null"       # Free file descriptors and
-        STDOUT.reopen "/dev/null", "a" # point them somewhere sensible.
-        STDERR.reopen '/dev/null', 'a'
-      end
+    unless noclose
+      STDIN.reopen "/dev/null"       # Free file descriptors and
+      STDOUT.reopen "/dev/null", "a" # point them somewhere sensible.
+      STDERR.reopen '/dev/null', 'a'
+    end
 
-      trap("TERM") { exit }
+    trap("TERM") { exit }
 
-      return 0
-    end
-  end
+    return 0
+  end unless respond_to?(:daemon)
 end
diff --git a/activesupport/lib/active_support/core_ext/range.rb b/activesupport/lib/active_support/core_ext/range.rb
index 0d2b169e3ff25..02532397484f9 100644
--- a/activesupport/lib/active_support/core_ext/range.rb
+++ b/activesupport/lib/active_support/core_ext/range.rb
@@ -1,11 +1,2 @@
-require 'active_support/core_ext/range/conversions'
-require 'active_support/core_ext/range/overlaps'
-require 'active_support/core_ext/range/include_range'
-require 'active_support/core_ext/range/blockless_step'
-
-class Range #:nodoc:
-  include ActiveSupport::CoreExtensions::Range::Conversions
-  include ActiveSupport::CoreExtensions::Range::Overlaps
-  include ActiveSupport::CoreExtensions::Range::IncludeRange
-  include ActiveSupport::CoreExtensions::Range::BlocklessStep
-end
+require 'active_support/core_ext/util'
+ActiveSupport.core_ext Range, %w(conversions overlaps include_range blockless_step)
diff --git a/activesupport/lib/active_support/core_ext/rexml.rb b/activesupport/lib/active_support/core_ext/rexml.rb
index b4891a9153296..6d35963558985 100644
--- a/activesupport/lib/active_support/core_ext/rexml.rb
+++ b/activesupport/lib/active_support/core_ext/rexml.rb
@@ -7,7 +7,7 @@
 unless (defined?(REXML::VERSION) ? REXML::VERSION : REXML::Version) > "3.1.7.2"
   require 'rexml/document'
 
-  # REXML in 1.8.7 has the patch but didn't update Version from 3.1.7.2.
+  # REXML in 1.8.7 has the patch but early patchlevels didn't update Version from 3.1.7.2.
   unless REXML::Document.respond_to?(:entity_expansion_limit=)
     require 'rexml/entity'
 
diff --git a/activesupport/lib/active_support/core_ext/symbol.rb b/activesupport/lib/active_support/core_ext/symbol.rb
index e4ac4438099f7..520369452badb 100644
--- a/activesupport/lib/active_support/core_ext/symbol.rb
+++ b/activesupport/lib/active_support/core_ext/symbol.rb
@@ -1,14 +1,14 @@
-unless :to_proc.respond_to?(:to_proc)
-  class Symbol
-    # Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:
-    #
-    #   # The same as people.collect { |p| p.name }
-    #   people.collect(&:name)
-    #
-    #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }
-    #   people.select(&:manager?).collect(&:salary)
-    def to_proc
-      Proc.new { |*args| args.shift.__send__(self, *args) }
-    end
-  end
+class Symbol
+  # Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:
+  #
+  #   # The same as people.collect { |p| p.name }
+  #   people.collect(&:name)
+  #
+  #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }
+  #   people.select(&:manager?).collect(&:salary)
+  #
+  # This is a builtin method in Ruby 1.8.7 and later.
+  def to_proc
+    Proc.new { |*args| args.shift.__send__(self, *args) }
+  end unless :to_proc.respond_to?(:to_proc)
 end
diff --git a/activesupport/lib/active_support/core_ext/time.rb b/activesupport/lib/active_support/core_ext/time.rb
index 78bbfc917c3d3..985dc45c9b449 100644
--- a/activesupport/lib/active_support/core_ext/time.rb
+++ b/activesupport/lib/active_support/core_ext/time.rb
@@ -29,14 +29,5 @@ def _dump(*args)
   end
 end
 
-require 'active_support/core_ext/time/behavior'
-require 'active_support/core_ext/time/calculations'
-require 'active_support/core_ext/time/conversions'
-require 'active_support/core_ext/time/zones'
-
-class Time#:nodoc:
-  include ActiveSupport::CoreExtensions::Time::Behavior
-  include ActiveSupport::CoreExtensions::Time::Calculations
-  include ActiveSupport::CoreExtensions::Time::Conversions
-  include ActiveSupport::CoreExtensions::Time::Zones
-end
+require 'active_support/core_ext/util'
+ActiveSupport.core_ext Time, %w(behavior calculations conversions zones)
diff --git a/activesupport/lib/active_support/core_ext/util.rb b/activesupport/lib/active_support/core_ext/util.rb
new file mode 100644
index 0000000000000..fc4666638ce6e
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/util.rb
@@ -0,0 +1,10 @@
+module ActiveSupport
+  class << self
+    def core_ext(subject, names)
+      names.each do |name|
+        require "active_support/core_ext/#{Inflector.underscore(subject.name)}/#{name}"
+        subject.send :include, Inflector.constantize("ActiveSupport::CoreExtensions::#{subject.name}::#{Inflector.camelize(name)}")
+      end
+    end
+  end
+end
diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index ab5a86668e68d..0e23c5c2dd88b 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -60,26 +60,6 @@ def test_since_and_ago_with_fractional_weeks
     assert_equal((7 * 24 * 1.7).hours.ago, 1.7.weeks.ago)
   end
 
-  def test_deprecated_fractional_years
-    years_re = /Fractional years are not respected\. Convert value to integer before calling #years\./
-    assert_deprecated(years_re){1.0.years}
-    assert_deprecated(years_re){1.5.years}
-    assert_not_deprecated{1.years}
-    assert_deprecated(years_re){1.0.year}
-    assert_deprecated(years_re){1.5.year}
-    assert_not_deprecated{1.year}
-  end
-
-  def test_deprecated_fractional_months
-    months_re = /Fractional months are not respected\. Convert value to integer before calling #months\./
-    assert_deprecated(months_re){1.5.months}
-    assert_deprecated(months_re){1.0.months}
-    assert_not_deprecated{1.months}
-    assert_deprecated(months_re){1.5.month}
-    assert_deprecated(months_re){1.0.month}
-    assert_not_deprecated{1.month}
-  end
-
   def test_since_and_ago_anchored_to_time_now_when_time_zone_default_not_set
     Time.zone_default = nil
     with_env_tz 'US/Eastern' do
diff --git a/activesupport/test/core_ext/float_ext_test.rb b/activesupport/test/core_ext/float_ext_test.rb
index d19b5ecf4704f..ac7e7a8ed6e54 100644
--- a/activesupport/test/core_ext/float_ext_test.rb
+++ b/activesupport/test/core_ext/float_ext_test.rb
@@ -1,4 +1,5 @@
 require 'abstract_unit'
+require 'active_support/core_ext/float/rounding'
 
 class FloatExtRoundingTests < Test::Unit::TestCase
   def test_round_for_positive_number