Merge pull request #16345 from robin850/rbx-tidy-bytes

Prevent using String#scrub on Rubinius

activesupport/lib/active_support/multibyte/unicode.rb

@@ -213,7 +213,8 @@ def compose(codepoints)
       end
 
       # Ruby >= 2.1 has String#scrub, which is faster than the workaround used for < 2.1.
-      if '<3'.respond_to?(:scrub)
+      # Rubinius' String#scrub, however, doesn't support ASCII-incompatible chars.
+      if '<3'.respond_to?(:scrub) && !defined?(Rubinius)
         # Replaces all ISO-8859-1 or CP1252 characters by their UTF-8 equivalent
         # resulting in a valid UTF-8 string.
         #