What happened to the CryptoOperation interface?

I was just going through the Editor's draft dated 30 August 2013 and was
shocked to find that there is no longer a definition of the CryptoOperation
interface in the document.   Instead a sequence of CryptoOperationData
objects are passed into the root call.  

 

I do however note that the excising was not complete as it is still included
in the verify method description.

 

I completely missed the reasoning behind this.  When was this discussed
either on the mailing list or in a telechat so I can go back and find the
justification/reasoning behind it.

 

Jim