Can we pickle continuations in PyPy? How?

Question

I am trying PyPy for the first time because I need serializable continuations. Specifically, this is what I am attempting:

from _continuation import continulet
import pickle

def f(cont):
    cont.switch(111)
    cont.switch(222)
    cont.switch(333)

c = continulet(f)

print(c.switch())
print(c.switch())
saved = pickle.dumps(c)

When I try to pickle c I get this error, though: NotImplementedError: continulet's pickle support is currently disabled.

So, is there some way to enable pickling of continuations? The message suggests this, but so far I couldn't find out how.

Edit: I am using "PyPy 7.3.1 with GCC 9.3.0" (Python 3.6.9) on Linux.