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-rw-r--r--activesupport/lib/active_support/core_ext/string/multibyte.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/multibyte.rb b/activesupport/lib/active_support/core_ext/string/multibyte.rb
index 075b206d04..07c0d16398 100644
--- a/activesupport/lib/active_support/core_ext/string/multibyte.rb
+++ b/activesupport/lib/active_support/core_ext/string/multibyte.rb
@@ -12,10 +12,12 @@ class String
# class. If the proxy class doesn't respond to a certain method, it's forwarded to the encapsulated string.
#
# >> "lj".upcase
- # => "LJ"
+ # => "lj"
# >> "lj".mb_chars.upcase.to_s
# => "LJ"
#
+ # NOTE: An above example is useful for pre Ruby 2.4. Ruby 2.4 supports Unicode case mappings.
+ #
# == Method chaining
#
# All the methods on the Chars proxy which normally return a string will return a Chars object. This allows