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-rw-r--r--activesupport/lib/active_support/multibyte/chars.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/multibyte/chars.rb b/activesupport/lib/active_support/multibyte/chars.rb
index 51b870de8c..d372b0ab1f 100644
--- a/activesupport/lib/active_support/multibyte/chars.rb
+++ b/activesupport/lib/active_support/multibyte/chars.rb
@@ -665,6 +665,11 @@ module ActiveSupport #:nodoc:
def translate_offset(byte_offset) #:nodoc:
return nil if byte_offset.nil?
return 0 if @wrapped_string == ''
+
+ if @wrapped_string.respond_to?(:force_encoding)
+ @wrapped_string = @wrapped_string.dup.force_encoding(Encoding::ASCII_8BIT)
+ end
+
begin
@wrapped_string[0...byte_offset].unpack('U*').length
rescue ArgumentError => e