Serhiy Storchaka added the comment:

Yet some nitpicks.

Currently the code of _PyLong_FromNbInt() is inlined and the do_decref flag is 
used to prevent needless change refcounts of int objects (see also issue18797). 
In proposed patch common code is extracted into the _PyLong_FromNbInt() 
function and int objects increfed and decrefed. Doesn't it affect a 
performance? PyLong_As* functions used in arguments parsing in a lot of 
builtins and their .performance is important.

If the patch slowdowns PyLong_As* functions we perhaps should check 
PyLong_CheckExact() before calling _PyLong_FromNbInt() and use the do_decref 
flag.

In general the idea and the patch LGTM.

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<http://bugs.python.org/issue17576>
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