ctypes bug ?

import sys
from ctypes import c_void_p, c_uint, WINFUNCTYPE, CFUNCTYPE, windll, memmove, c_char_p

GlobalAlloc = windll.kernel32.GlobalAlloc
GlobalAlloc.argtypes = [c_uint, c_uint]
GlobalAlloc.restype = c_void_p


if sys.argv[1] == 'b':
    GlobalLock = windll.kernel32.GlobalLock
    GlobalLock.argtypes = [c_void_p]
    GlobalLock.restype = c_void_p
elif sys.argv[1] == 'w':
    GlobalLock = WINFUNCTYPE(c_void_p, c_void_p)(windll.kernel32.GlobalLock)
elif sys.argv[1] == 'c':
    GlobalLock = CFUNCTYPE(c_void_p, c_void_p)(windll.kernel32.GlobalLock)
else:
    assert False

hdl = GlobalAlloc(2,100)
print(hdl)

buff   = GlobalLock(hdl)
print(buff)

cbuf = c_char_p(buff)
memmove(cbuf, c_char_p(b"TestTest"), 9)

print(cbuf.value)




TRANS_SCRIPT = """
~/tmp $ py -3.7-32 alloc.py b
55640068
15507016
b'TestTest'
~/tmp $ py -3.7-32 alloc.py c
58916868
18060520
b'TestTest'
~/tmp $ py -3.7-32 alloc.py w
49807364
10973464
b'TestTest'
~/tmp $ py -3.8-64 alloc.py b
1629464494088
1629430083152
b'TestTest'
~/tmp $ py -3.8-64 alloc.py w
2574623965192
Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 237, in 'calling callback function'
ctypes.ArgumentError: argument 1: <class 'OverflowError'>: int too long to convert
2574591640016
~/tmp $ py -3.8-64 alloc.py c
2903999250440
Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 237, in 'calling callback function'
ctypes.ArgumentError: argument 1: <class 'OverflowError'>: int too long to convert
2903995302352
"""