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Mon Nov 22 11:47:09 CET 2010 · http://mail.python.org/pipermail/python-dev/2010-November/105794.html

"Martin v. Löwis" writes:

 > More interestingly (and to the subject) is chr: how did you arrive
 > at C9 banning Python3's definition of chr? This chr function puts
 > the code sequence into well-formed UTF-16; that's the whole point of
 > UTF-16.

No, it doesn't, in the specific case of surrogate code points.  In
3.1.2 from MacPorts on a iBook G4 and from Gentoo on AMD64,
chr(0xd800) returns "\ud800".

I don't know if that's by design (eg, so that it can be used in the
implementation of the surrogateescape error handler) or a correctable
oversight, but it's not conformant.

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[Python-Dev] len(chr(i)) = 2?