Remove some of the ActiveSupport core extensions related to 1.8.

actionpack/lib/action_view/helpers/number_helper.rb

 # encoding: utf-8
 
 require 'active_support/core_ext/big_decimal/conversions'
-require 'active_support/core_ext/float/rounding'
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/string/output_safety'
 

actionpack/lib/action_view/template/resolver.rb

 require "pathname"
 require "active_support/core_ext/class"
-require "active_support/core_ext/io"
 require "action_view/template"
 
 module ActionView

activesupport/lib/active_support/core_ext/date/freeze.rb

-# Date memoizes some instance methods using metaprogramming to wrap
-# the methods with one that caches the result in an instance variable.
-#
-# If a Date is frozen but the memoized method hasn't been called, the
-# first call will result in a frozen object error since the memo
-# instance variable is uninitialized.
-#
-# Work around by eagerly memoizing before the first freeze.
-#
-# Ruby 1.9 uses a preinitialized instance variable so it's unaffected.
-# This hack is as close as we can get to feature detection:
-if RUBY_VERSION < '1.9'
-  require 'date'
-  begin
-    ::Date.today.freeze.jd
-  rescue => frozen_object_error
-    if frozen_object_error.message =~ /frozen/
-      class Date #:nodoc:
-        def freeze
-          unless frozen?
-            self.class.private_instance_methods(false).each do |m|
-              if m.to_s =~ /\A__\d+__\Z/
-                instance_variable_set(:"@#{m}", [send(m)])
-              end
-            end
-          end
-
-          super
-        end
-      end
-    end
-  end
-end

activesupport/lib/active_support/core_ext/float.rb

-require 'active_support/core_ext/float/rounding'

activesupport/lib/active_support/core_ext/float/rounding.rb

-class Float
-  alias precisionless_round round
-  private :precisionless_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(precision = nil)
-    if precision
-      magnitude = 10.0 ** precision
-      (self * magnitude).round / magnitude
-    else
-      precisionless_round
-    end
-  end
-end if RUBY_VERSION < '1.9'

activesupport/lib/active_support/core_ext/io.rb

-if RUBY_VERSION < '1.9.2'
-
-# :stopdoc:
-class IO
-  def self.binread(name, length = nil, offset = nil)
-    return File.read name unless length || offset
-    File.open(name, 'rb') { |f|
-      f.seek offset if offset
-      f.read length
-    }
-  end
-end
-# :startdoc:
-
-end

activesupport/lib/active_support/time.rb

@@ -21,7 +21,6 @@ module ActiveSupport
 require 'active_support/core_ext/time/zones'
 
 require 'active_support/core_ext/date/acts_like'
-require 'active_support/core_ext/date/freeze'
 require 'active_support/core_ext/date/calculations'
 require 'active_support/core_ext/date/conversions'
 require 'active_support/core_ext/date/zones'

activesupport/test/core_ext/float_ext_test.rb

-require 'abstract_unit'
-require 'active_support/core_ext/float/rounding'
-
-class FloatExtRoundingTests < Test::Unit::TestCase
-  def test_round_for_positive_number
-    assert_equal 1,    1.4.round
-    assert_equal 2,    1.6.round
-    assert_equal 2,    1.6.round(0)
-    assert_equal 1.4,  1.4.round(1)
-    assert_equal 1.4,  1.4.round(3)
-    assert_equal 1.5,  1.45.round(1)
-    assert_equal 1.45, 1.445.round(2)
-  end
-
-  def test_round_for_negative_number
-    assert_equal( -1,   -1.4.round )
-    assert_equal( -2,   -1.6.round )
-    assert_equal( -1.4, -1.4.round(1) )
-    assert_equal( -1.5, -1.45.round(1) )
-  end
-
-  def test_round_with_negative_precision
-    assert_equal 123460.0, 123456.0.round(-1)
-    assert_equal 123500.0, 123456.0.round(-2)
-  end
-end

activesupport/test/core_ext/io_test.rb

-require 'abstract_unit'
-
-require 'active_support/core_ext/io'
-
-class IOTest < Test::Unit::TestCase
-  def test_binread_one_arg
-    assert_equal File.read(__FILE__), IO.binread(__FILE__)
-  end
-
-  def test_binread_two_args
-    assert_equal File.read(__FILE__).bytes.first(10).pack('C*'),
-      IO.binread(__FILE__, 10)
-  end
-
-  def test_binread_three_args
-    actual = IO.binread(__FILE__, 5, 10)
-    expected = File.open(__FILE__, 'rb') { |f|
-      f.seek 10
-      f.read 5
-    }
-    assert_equal expected, actual
-  end
-end

railties/guides/source/active_support_core_extensions.textile

@@ -1974,18 +1974,6 @@ The method +ordinalize+ returns the ordinal string corresponding to the receiver
 
 NOTE: Defined in +active_support/core_ext/integer/inflections.rb+.
 
-h3. Extensions to +Float+
-
-h4. +round+
-
-The built-in method +Float#round+ rounds a float to the nearest integer. In Ruby 1.9 this method takes an optional argument to let you specify a precision. Active Support adds that functionality to +round+ in previous versions of Ruby:
-
-<ruby>
-Math::E.round(4) # => 2.7183
-</ruby>
-
-NOTE: Defined in +active_support/core_ext/float/rounding.rb+.
-
 h3. Extensions to +BigDecimal+
 
 ...