24.12.2014 19:15, Jim Starkey wrote:
> For example, if a new
> index encoding is added, a new engine must be able to handle both the
> old and new formats, but an old engine can't possibly understand the new
> format.

   IMHO, this is an example of major change.

> It well might mean version checks in the code.  That's the cost of
> forward compatibility.
>
> No engine should ever attempt to handle two major versions.

   With version checks in code, there is no difference what is volume of 
changes to handle.

-- 
   WBR, SD.

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