fix ASCII compatibility check in __Pyx_init_sys_getdefaultencoding_params(): strncmp() stops at first NUL byte which is the first byte in this case (i.e. no comparison is done at all)

fix ASCII compatibility check in __Pyx_init_sys_getdefaultencoding_params(): strncmp() stops at first NUL byte which is the first byte in this case (i.e. no comparison is done at all)

--HG--
extra : transplant_source : A%2B%5BO%82%05%F7%DEm/%8Ao%08%121%96%8Ao%AB%8C

--HG--
extra : transplant_source : %CD%DB%8CT%85r%FF%0B%1C%60%B3%CD%F8%16%D8%E3%EC%C7%0BL

IPython magics

make encoding setup code safer by not expecting sys.getdefaultencoding() to safely return a bytes object

avoid C compiler warnings for different integer types and signedness when bounds-checking index in obj.pop() optimisation

Expanded POSIX interface

This reverts commit dab5ac36.

Fix typos in the CPython module include file