[Python-Dev] Disabling Unicode readbuffer interface

[Guido van Rossum]

I haven't researched this to the bottom, but based on the email
exchange, it seems that keeping getreadbuf and special-casing s# for
Unicode objects makes the most sense.  That makes the 's' and 's#'
more similar.  Note that 'z#' should also be fixed.

I believe that SRE uses PyObject_AsReadBuffer() so that it can work
with arrays of shorts as well (when shorts are two chars).  Kind of
cute.

--Guido van Rossum (home page: http://www.pythonlabs.com/~guido/)