While [`cpython.mem`](http://docs.cython.org/en/latest/src/tutorial/memory_allocation.html) [contains](https://github.com/cython/cython/blob/1593b297d132df0ef894b072ade7b539cd774dd7/Cython/Includes/cpython/mem.pxd#L25-L54) the other [raw allocators](https://docs.python.org/3/c-api/memory.html#raw-memory-interface), it is missing [`PyMem_RawCalloc`](https://docs.python.org/3/c-api/memory.html#c.PyMem_RawCalloc).
While
cpython.memcontains the other raw allocators, it is missingPyMem_RawCalloc.