On Fri, 19 Jun 2009 at 14:15, Antoine Pitrou wrote:
Benjamin Peterson <benjamin <at> python.org> writes:
I mean that if you pass X and Y into a function and get Z in 2.6, then
you should be able to get Z from passing X and Y in 2.7 even if
there's a new argument that returns Z' if you pass True to it.
Well, except if returning Z rather than Z' was a bug.
I'm pretty sure there have been cases of keeping buggy behavior in point
releases for backward compatibility reasons. I think the decision has
depended on the nature, severity, and age of the bug, and the estimated
likelihood that code in the wild would break if the bug were fixed.
--David
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