[MERGE]

[Martin Pool]

On 9 Mar 2006, at 14:31 , Robert Collins wrote:

> Transactions finished callbacks
>
> This patch implements a 'transaction_finished' callback to dirty  
> objects
> in a transaction and uses it to trap write attempts to VersionedFiles
> outside of the transaction they were created in, as well as using this
> new safety to implement in-knit caches to ensure data is only  
> downloaded
> once during a transaction.
>
+1

I'm curious why you're often adding comments for tests but not  
docstrings?

-- 
Martin Pool