pickle bug?

gistfile1.txt

import pickle
import numpy as np
import multiprocessing as mp

a = np.array([1,2,3], dtype=np.uint32)
b = np.array([1,2,3], dtype=np.uint32)
c = np.array([1,2,3], dtype=np.uint32)
d = np.array([1,2,3], dtype=np.uint32)

q = mp.Queue()
q.put(a)
d = q.get()
print(id(a), id(b), id(c), id(d))

print('[a]==[b]', pickle.dumps([a]) == pickle.dumps([b]))
print('[a]==[c]', pickle.dumps([a]) == pickle.dumps([c]))
print('[b]==[c]', pickle.dumps([b]) == pickle.dumps([c]))
print('[a,b]==[a,c]', pickle.dumps([a,b]) == pickle.dumps([a,c]))
print('[a,b]==[a,d]', pickle.dumps([a,b]) == pickle.dumps([a,d]))
print('c.tolist()==d.tolist()', c.tolist()==d.tolist())