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diff --git a/vendor/rails/activesupport/lib/active_support/multibyte.rb b/vendor/rails/activesupport/lib/active_support/multibyte.rb
new file mode 100644
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+++ b/vendor/rails/activesupport/lib/active_support/multibyte.rb
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+# encoding: utf-8
+
+require 'active_support/multibyte/chars'
+require 'active_support/multibyte/exceptions'
+require 'active_support/multibyte/unicode_database'
+
+module ActiveSupport #:nodoc:
+  module Multibyte
+    # A list of all available normalization forms. See http://www.unicode.org/reports/tr15/tr15-29.html for more
+    # information about normalization.
+    NORMALIZATION_FORMS = [:c, :kc, :d, :kd]
+
+    # The Unicode version that is supported by the implementation
+    UNICODE_VERSION = '5.1.0'
+
+    # The default normalization used for operations that require normalization. It can be set to any of the
+    # normalizations in NORMALIZATION_FORMS.
+    #
+    # Example:
+    #   ActiveSupport::Multibyte.default_normalization_form = :c
+    mattr_accessor :default_normalization_form
+    self.default_normalization_form = :kc
+
+    # The proxy class returned when calling mb_chars. You can use this accessor to configure your own proxy
+    # class so you can support other encodings. See the ActiveSupport::Multibyte::Chars implementation for
+    # an example how to do this.
+    #
+    # Example:
+    #   ActiveSupport::Multibyte.proxy_class = CharsForUTF32
+    mattr_accessor :proxy_class
+    self.proxy_class = ActiveSupport::Multibyte::Chars
+  end
+end