Page "MIME" Paragraph 20

" We did not adequately specify how to handle a future MIME version ," Borenstein said.

" So if you write something that knows 1. 0, what should you do if you encounter 2. 0 or 1. 1?

I sort of thought it was obvious but it turned out everyone implemented that in different ways.

And the result is that it would be just about impossible for the Internet to ever define a 2. 0 or a 1. 1.