Implement native Py_UCS4 support
|Reported by:||scoder||Owned by:||scoder|
|Component:||Cython Language Feature||Keywords:|
CPython's Py_UCS4 type is capable of representing a Unicode code point on all platforms, which isn't the case for Py_UNICODE. Cython should natively support this type and the coercion from and to unicode string objects.