String performance regression from python 3.2 to 3.3

Thomas 'PointedEars' Lahn PointedEars at
Wed Mar 13 18:42:21 CET 2013

Chris Angelico wrote:

> On Wed, Mar 13, 2013 at 9:11 PM, rusi <rustompmody at> wrote:
>> Uhhh..
>> Making the subject line useful for all readers
> I should have read this one before replying in the other thread.
> jmf, I'd like to see evidence that there has been a performance
> regression compared against a wide build of Python 3.2. You still have
> never answered this fundamental, that the narrow builds of Python are
> *BUGGY* in the same way that JavaScript/ECMAScript is.

Interesting.  From my work I was under the impression that I knew ECMAScript 
and its implementations fairly well, yet I have never heard of this before.

What do you mean by “narrow build” and “wide build” and what exactly is the 
bug “narrow builds” of Python 3.2 have in common with JavaScript/ECMAScript?  
To which implementation of ECMAScript are you referring – or are you 
referring to the Specification as such?


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