issue on titleize non UTF-8 string?

Trying to use .titleize on a non UTF-8 string and getting an unexpected value.
Example:
2.0.0 (main):0 > “VOCÊ”.titleize

=> “VocÊ”

The result should be “Você”

I think this is an unexpected behave from Ruby

2.1.5 :001 > “VOCÊ”.downcase

=> “vocÊ”
Maybe .**titleize **can use mb_chars as the default way to titleize a string to “fix” this.

2.0.0 (main):0 > “VOCÊ”.mb_chars.titleize.to_s

=> “Você”

What u guys think about it?