Larry Hastings added the comment:

You're right, deprecation sounds best.  If Georg or Benjamin want the fix in 
earlier releases I'll split the pysqlite_connection_call into another issue, 
otherwise I won't bother.

As for fixing the undefined behavior in older versions: since its behavior is 
undefined, yes, it *could* cause a crash.  But by that token it *could* 
teleport you to Mars and give you a funny-looking nose.  In practice it 
*should* be utterly harmless, as I believe every platform supported by Python 
3.4 uses the caller-pops-stack calling convention.  And we've lived with it for 
this long, so it doesn't seem to be hurting anything.  But like all undefined 
behavior I can make no guarantee.

MvL in particular comes down like a ton of bricks whenever someone proposes 
checking in code that's technically undefined behavior.  I've had the relevant 
chapter and verse of the C standard quoted at me for this exact thing (calling 
a function pointer using a sliiiightly different signature than the actual 
function).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20274>
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