13 files changed, 77 insertions, 32 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/compact.rb b/activesupport/lib/active_support/core_ext/hash/compact.rb
index 6566215a4d..5dc9a05ec7 100644
--- a/activesupport/lib/active_support/core_ext/hash/compact.rb
+++ b/activesupport/lib/active_support/core_ext/hash/compact.rb
@@ -1,6 +1,6 @@
 class Hash
   # Returns a hash with non +nil+ values.
-  # 
+  #
   #   hash = { a: true, b: false, c: nil}
   #   hash.compact # => { a: true, b: false}
   #   hash # => { a: true, b: false, c: nil}
@@ -8,9 +8,9 @@ class Hash
   def compact
     self.select { |_, value| !value.nil? }
   end
-  
+
   # Replaces current hash with non +nil+ values.
-  # 
+  #
   #   hash = { a: true, b: false, c: nil}
   #   hash.compact! # => { a: true, b: false}
   #   hash # => { a: true, b: false}
diff --git a/activesupport/lib/active_support/core_ext/hash/except.rb b/activesupport/lib/active_support/core_ext/hash/except.rb
index 682d089881..6e397abf51 100644
--- a/activesupport/lib/active_support/core_ext/hash/except.rb
+++ b/activesupport/lib/active_support/core_ext/hash/except.rb
@@ -1,13 +1,19 @@
 class Hash
-  # Returns a hash that includes everything but the given keys. This is useful for
-  # limiting a set of parameters to everything but a few known toggles:
+  # Returns a hash that includes everything but the given keys.
+  #   hash = { a: true, b: false, c: nil}
+  #   hash.except(:c) # => { a: true, b: false}
+  #   hash # => { a: true, b: false, c: nil}
   #
+  # This is useful for limiting a set of parameters to everything but a few known toggles:
   #   @person.update(params[:person].except(:admin))
   def except(*keys)
     dup.except!(*keys)
   end
 
   # Replaces the hash without the given keys.
+  #   hash = { a: true, b: false, c: nil}
+  #   hash.except!(:c) # => { a: true, b: false}
+  #   hash # => { a: true, b: false }
   def except!(*keys)
     keys.each { |key| delete(key) }
     self
diff --git a/activesupport/lib/active_support/core_ext/hash/slice.rb b/activesupport/lib/active_support/core_ext/hash/slice.rb
index 8ad600b171..41b2279013 100644
--- a/activesupport/lib/active_support/core_ext/hash/slice.rb
+++ b/activesupport/lib/active_support/core_ext/hash/slice.rb
@@ -1,6 +1,12 @@
 class Hash
-  # Slice a hash to include only the given keys. This is useful for
-  # limiting an options hash to valid keys before passing to a method:
+  # Slice a hash to include only the given keys. Returns a hash containing 
+  # the given keys.
+  # 
+  #   { a: 1, b: 2, c: 3, d: 4 }.slice(:a, :b)
+  #   # => {:a=>1, :b=>2}
+  # 
+  # This is useful for limiting an options hash to valid keys before 
+  # passing to a method:
   #
   #   def search(criteria = {})
   #     criteria.assert_valid_keys(:mass, :velocity, :time)
diff --git a/activesupport/lib/active_support/core_ext/string/filters.rb b/activesupport/lib/active_support/core_ext/string/filters.rb
index 2b1583d4ac..096292dc58 100644
--- a/activesupport/lib/active_support/core_ext/string/filters.rb
+++ b/activesupport/lib/active_support/core_ext/string/filters.rb
@@ -13,6 +13,9 @@ class String
   end
 
   # Performs a destructive squish. See String#squish.
+  #   str = " foo   bar    \n   \t   boo"
+  #   str.squish!                         # => "foo bar boo"
+  #   str                                 # => "foo bar boo"
   def squish!
     gsub!(/\A[[:space:]]+/, '')
     gsub!(/[[:space:]]+\z/, '')
@@ -20,14 +23,24 @@ class String
     self
   end
 
-  # Returns a new string with all occurrences of the pattern removed. Short-hand for String#gsub(pattern, '').
-  def remove(pattern)
-    gsub pattern, ''
+  # Returns a new string with all occurrences of the patterns removed.
+  #   str = "foo bar test"
+  #   str.remove(" test")                 # => "foo bar"
+  #   str                                 # => "foo bar test"
+  def remove(*patterns)
+    dup.remove!(*patterns)
   end
 
-  # Alters the string by removing all occurrences of the pattern. Short-hand for String#gsub!(pattern, '').
-  def remove!(pattern)
-    gsub! pattern, ''
+  # Alters the string by removing all occurrences of the patterns.
+  #   str = "foo bar test"
+  #   str.remove!(" test")                 # => "foo bar"
+  #   str                                  # => "foo bar"
+  def remove!(*patterns)
+    patterns.each do |pattern|
+      gsub! pattern, ""
+    end
+
+    self
   end
 
   # Truncates a given +text+ after a given <tt>length</tt> if +text+ is longer than <tt>length</tt>:
diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index 042283e4fc..ba92afd5f4 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -247,6 +247,11 @@ module ActiveSupport #:nodoc:
 end
 
 class String
+  # Marks a string as trusted safe. It will be inserted into HTML with no
+  # additional escaping performed. It is your responsibilty to ensure that the
+  # string contains no malicious content. This method is equivalent to the
+  # `raw` helper in views. It is recommended that you use `sanitize` instead of
+  # this method. It should never be called on user input.
   def html_safe
     ActiveSupport::SafeBuffer.new(self)
   end
diff --git a/activesupport/lib/active_support/core_ext/time/zones.rb b/activesupport/lib/active_support/core_ext/time/zones.rb
index bbda04d60c..64c3b7201b 100644
--- a/activesupport/lib/active_support/core_ext/time/zones.rb
+++ b/activesupport/lib/active_support/core_ext/time/zones.rb
@@ -1,4 +1,5 @@
 require 'active_support/time_with_zone'
+require 'active_support/core_ext/time/acts_like'
 require 'active_support/core_ext/date_and_time/zones'
 
 class Time
diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb
index a89c769e34..65a370dd30 100644
--- a/activesupport/lib/active_support/dependencies.rb
+++ b/activesupport/lib/active_support/dependencies.rb
@@ -205,7 +205,10 @@ module ActiveSupport #:nodoc:
     # Object includes this module.
     module Loadable #:nodoc:
       def self.exclude_from(base)
-        base.class_eval { define_method(:load, Kernel.instance_method(:load)) }
+        base.class_eval do
+          define_method(:load, Kernel.instance_method(:load))
+          private :load
+        end
       end
 
       def require_or_load(file_name)
@@ -241,18 +244,6 @@ module ActiveSupport #:nodoc:
         raise
       end
 
-      def load(file, wrap = false)
-        result = false
-        load_dependency(file) { result = super }
-        result
-      end
-
-      def require(file)
-        result = false
-        load_dependency(file) { result = super }
-        result
-      end
-
       # Mark the given constant as unloadable. Unloadable constants are removed
       # each time dependencies are cleared.
       #
@@ -269,6 +260,20 @@ module ActiveSupport #:nodoc:
       def unloadable(const_desc)
         Dependencies.mark_for_unload const_desc
       end
+
+      private
+
+      def load(file, wrap = false)
+        result = false
+        load_dependency(file) { result = super }
+        result
+      end
+
+      def require(file)
+        result = false
+        load_dependency(file) { result = super }
+        result
+      end
     end
 
     # Exception file-blaming.
diff --git a/activesupport/lib/active_support/dependencies/autoload.rb b/activesupport/lib/active_support/dependencies/autoload.rb
index c0dba5f7fd..13036d521d 100644
--- a/activesupport/lib/active_support/dependencies/autoload.rb
+++ b/activesupport/lib/active_support/dependencies/autoload.rb
@@ -67,7 +67,7 @@ module ActiveSupport
     end
 
     def eager_load!
-      @_autoloads.values.each { |file| require file }
+      @_autoloads.each_value { |file| require file }
     end
 
     def autoloads
diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb
index 584fc1e1c5..0de1d2c7df 100644
--- a/activesupport/lib/active_support/duration.rb
+++ b/activesupport/lib/active_support/duration.rb
@@ -1,4 +1,3 @@
-require 'active_support/proxy_object'
 require 'active_support/core_ext/array/conversions'
 require 'active_support/core_ext/object/acts_like'
 
@@ -103,6 +102,8 @@ module ActiveSupport
       @value.respond_to?(method, include_private)
     end
 
+    delegate :<=>, to: :value
+
     protected
 
       def sum(sign, time = ::Time.current) #:nodoc:
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index 4e0796f4f8..a8a8de5672 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -40,7 +40,7 @@ module ActiveSupport
       data, digest = signed_message.split("--")
       if data.present? && digest.present? && ActiveSupport::SecurityUtils.secure_compare(digest, generate_digest(data))
         begin
-          @serializer.load(::Base64.strict_decode64(data))
+          @serializer.load(decode(data))
         rescue ArgumentError => argument_error
           raise InvalidSignature if argument_error.message =~ %r{invalid base64}
           raise
@@ -51,11 +51,19 @@ module ActiveSupport
     end
 
     def generate(value)
-      data = ::Base64.strict_encode64(@serializer.dump(value))
+      data = encode(@serializer.dump(value))
       "#{data}--#{generate_digest(data)}"
     end
 
     private
+      def encode(data)
+        ::Base64.strict_encode64(data)
+      end
+
+      def decode(data)
+        ::Base64.strict_decode64(data)
+      end
+
       def generate_digest(data)
         require 'openssl' unless defined?(OpenSSL)
         OpenSSL::HMAC.hexdigest(OpenSSL::Digest.const_get(@digest).new, @secret, data)
diff --git a/activesupport/lib/active_support/multibyte/unicode.rb b/activesupport/lib/active_support/multibyte/unicode.rb
index 7d45961515..7ab6293b60 100644
--- a/activesupport/lib/active_support/multibyte/unicode.rb
+++ b/activesupport/lib/active_support/multibyte/unicode.rb
@@ -11,7 +11,7 @@ module ActiveSupport
       NORMALIZATION_FORMS = [:c, :kc, :d, :kd]
 
       # The Unicode version that is supported by the implementation
-      UNICODE_VERSION = '6.3.0'
+      UNICODE_VERSION = '7.0.0'
 
       # The default normalization used for operations that require
       # normalization. It can be set to any of the normalizations
diff --git a/activesupport/lib/active_support/notifications.rb b/activesupport/lib/active_support/notifications.rb
index 325a3d75dc..b9f8e1ab2c 100644
--- a/activesupport/lib/active_support/notifications.rb
+++ b/activesupport/lib/active_support/notifications.rb
@@ -16,7 +16,7 @@ module ActiveSupport
   #     render text: 'Foo'
   #   end
   #
-  # That executes the block first and notifies all subscribers once done.
+  # That first executes the block and then notifies all subscribers once done.
   #
   # In the example above +render+ is the name of the event, and the rest is called
   # the _payload_. The payload is a mechanism that allows instrumenters to pass
diff --git a/activesupport/lib/active_support/values/unicode_tables.dat b/activesupport/lib/active_support/values/unicode_tables.dat
index 394ee95f4b..760be4c07a 100644
--- a/activesupport/lib/active_support/values/unicode_tables.dat
+++ b/activesupport/lib/active_support/values/unicode_tables.dat