how to use python pickle with RPR_GetProjExtState

[Levitanus]

Yep, I know, python is not the best choice for reascript, but I know it more that eel or lua...

here is first try to use serialization of something more complex than value, and I generally, can't get why len of original pickle is smaller than got from project.
Also I poorly understand concept of valOutNeedBig_sz
from RPR_GetProjExtState. Why and how to use it?

from reaper_python import *
from misc import pr
import pickle

obj = {"one": 123, "two": [1, 2, 3]}
output = pickle.dumps(obj)
pr(output)

RPR_SetProjExtState(0, 'Levitanus_sample_editing_pack', 'test', output)


retval = RPR_GetProjExtState(0, 'Levitanus_sample_editing_pack', 'test',
                             1, 100)
pr(retval[4])
pr('len of output = %s, length of return = %s' %
   (len(output), len(bytes(retval[4].strip(), 'utf-8'))))
serialized = pickle.loads(bytes(retval[4], 'ASCII'))
pr(serialized)

[Levitanus]

OK I used 0 protocol and it works.

from reaper_python import *
from misc import pr
import pickle

obj = {"one": 123, "two": [1, 2, 3]}
output = pickle.dumps(obj, 0).decode()
pr(output)

RPR_SetProjExtState(0, 'Levitanus_sample_editing_pack', 'test', output)


retval = RPR_GetProjExtState(0, 'Levitanus_sample_editing_pack', 'test',
                             1, 100)
pr(retval[4])
serialized = pickle.loads(bytes(retval[4], 'ASCII'))
pr(serialized)

But json made it better)

from reaper_python import *
from misc import pr
import json

obj = {"one": 123, "two": [1, 2, 3]}
output = json.dumps(obj)
pr(output)

RPR_SetProjExtState(0, 'Levitanus_sample_editing_pack', 'test', output)


retval = RPR_GetProjExtState(0, 'Levitanus_sample_editing_pack', 'test',
                             1, 100)
pr(retval[4])
serialized = json.loads(retval[4])
pr(serialized)