It's all the same to me

It's all the same to me.

  (British, American & Australian) also It's all one to me. (Australian)
something that you say when it is not important to you what happens 'Would you prefer to go out for a meal or eat in?' 'It's all the same to me.'
See also: all, same
References in classic literature ?
No, it's all the same to me," said Levin, unable to suppress a smile.