[Rails] Agile book deltas

[Xavier Noria]

On Jan 1, 2006, at 17:12, Stephen Waits wrote:

>
> On Jan 1, 2006, at 4:01 AM, Xavier Noria wrote:
>
>> Are there deltas for the revisions of the PDF version of the Agile  
>> book?
>
>     http://books.pragprog.com/titles/rails/errata

Yeah, I know that page but on one hand the label of the rightmost  
column is confusing because I don't know whether the issue has been  
just reported or fixed, and it is strange in the second half of the  
page there's no entry for 4.0.

How can one figure out what is new in 4.0?

-- fxn