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New version of the patch with the error handling callback 
registry. 

> > OK, done, now there's a
> > PyCodec_EscapeReplaceUnicodeEncodeErrors/
> > codecs.escapereplace_unicodeencode_errors
> > that uses \u (or \U if x>0xffff (with a wide build
> > of Python)).
> 
> Great!

Now PyCodec_EscapeReplaceUnicodeEncodeErrors uses \x
in addition to \u and \U where appropriate.

> > [...] 
> > But for special one-shot error handlers, it might still 
be
> > useful to pass the error handler directly, so maybe we
> > should leave error as PyObject *, but implement the
> > registry anyway?
> 
> Good idea !
> 
> One minor nit: codecs.registerError() should be named
> codecs.register_errorhandler() to be more inline with
> the Python coding style guide.

OK, but these function are specific to unicode encoding,
so now the functions are called:
   codecs.register_unicodeencodeerrorhandler
   codecs.lookup_unicodeencodeerrorhandler

Now all callbacks (including the new 
ones: "xmlcharrefreplace" 
and "escapereplace") are registered in the 
codecs.c/_PyCodecRegistry_Init so using them is really 
simple: u"gürk".encode("ascii", "xmlcharrefreplace")