String.contains(CharSequence) calls toString on argument

[Tomasz Kowalczewski]

Hello!

Current implementation of String.contains that accepts CharSequence calls
toString on it and passes resulting string to indexOf(String). This IMO
defeats the purpose of using CharSequences (that is to have a mutable
character buffer and not allocate unnecessary objects).

Is changing this a desirable development? It seems pretty straightforward
to port indexOf(String) to use CharSequence.

If all you need is patch then I can work on it (I have signed OCA) just
wanted to make sure it is not a futile work.

-- 
Regards,
Tomasz Kowalczewski