It looks like this change introduced a subtle, and maybe intended (?), behavioural change.

Consider (from MicroPython's test suite):

def f():
    n = 0 
    while True:
        n = yield n + 1 
        print(n)

g = f()
try:
    g.send(1)
except TypeError:
    print("caught")

print(g.send(None))
print(g.send(100))
print(g.send(200))

This used to work prior to commit b37181e69209746adc2119c471599a1ea5faa6c8.  But after that commit it fails on the print(g.send(None)) because the generator is now stopped.