Describe the bug

The documentation claims that set_random_number_generator(None) makes python-igraph use igraph's native RNG instead of the one from Python. Apparently this is not the case; it keeps on using the Python-based rng.

To reproduce

from igraph import Graph, set_random_number_generator
from time import time

start = time()
g = Graph.Degree_Sequence([750] * 1000, method="vl")
print(time() - start)

set_random_number_generator(None)

start = time()
g = Graph.Degree_Sequence([750] * 1000, method="vl")
print(time() - start)

The two calls take identical time, even though it heavily uses the RNG.

Version information

0.9.4