Try to work around differing GC behaviour of NumPy 1.14 in a doctest.
Try to work around differing GC behaviour of NumPy 1.14 in a doctest.

cython/cython,da-woods/cython,scoder/cython,scoder/cython,scoder/cython,cython/cython,scoder/cython,da-woods/cython,da-woods/cython,da-woods/cython,cython/cython,cython/cython