Chars class doesn't proxy "include?"

Problem is

>> "foo".chars.handler.respond_to?("include?")
=> true
>> "foo".chars.handler
=> ActiveSupport::Multibyte::Handlers::UTF8Handler

that is a Class object, which responds to "include?" because of Module#include?. That method expects an argument and it is being passes the proxied string and the argument itself.

Let me rephrase the comment above.

The proxy asks first the handler if it responds to the method, if it does not sends it to the proxied string.

Since the handler responds to "include?" it gets called on it, but that method is Module#include?. So indeed there's a mismatch in the interface, and additionallly that's the explanation for the way it breaks.

Yep, I agree that this is the problem. What do you think, is it appropriate to just add an include? method to Chars (or UTF8Handler)? or is there a cleaner fix?

I think #include? should be defined for Multibyte..

The correct fix would be to add an include? method to the handler.

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