XXX-zope4py3: zodbpickle: Dirty hack to have encoding sets to utf-8.

Otherwise it fails with the following exception because of non-ASCII characters
(`[A-Z&é@{]{3,7})`) (see unconvert()) below):

  => erp5_core/PathTemplateItem/portal_preferences/default_site_preference.xml
     File "zodbpickle-2.0.0-py3.7-linux-x86_64.egg/zodbpickle/pickle_3.py", line 844, in load
        dispatch[key[0]](self)
     File "zodbpickle-2.0.0-py3.7-linux-x86_64.egg/zodbpickle/pickle_3.py", line 1035, in load_short_binstring
        self.append(self.decode_string(data))
     File "zodbpickle-2.0.0-py3.7-linux-x86_64.egg/zodbpickle/pickle_3.py", line 989, in decode_string
        return value.decode(self.encoding, self.errors)
  UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 19: ordinal not in range(128)

component/ZODB/buildout.cfg

@@ -47,7 +47,7 @@ eggs    = ${ZODB:egg}
 recipe  = zc.recipe.egg:eggs
 egg     = ZODB
 eggs    = ${:egg}
-depends = ${persistent:egg} ${BTrees:egg}
+depends = ${persistent:egg} ${BTrees:egg} ${zodbpickle:egg}
 
 [ZODB4]
 <= _ZODB
@@ -91,12 +91,19 @@ recipe = zc.recipe.egg:custom
 egg = ${:_buildout_section_name_}
 setup-eggs = ${python-cffi:egg}
 
+[zodbpickle]
+recipe = zc.recipe.egg:custom
+egg = zodbpickle
+patches =
+  ${:_profile_base_location_}/../../component/egg-patch/zodbpickle/utf8-by-default.patch#bef23b1883d175e1238b9aaf38faaa7b
+patch-options = -p1
+patch-binary = ${patch:location}/bin/patch
 
 # eggs that are common to ZODB4 and ZODB5.
 [versions]
 BTrees = 4.11.3
 persistent = 4.9.3
-zodbpickle = 2.6.0
+zodbpickle = 2.6.0+SlapOSPatched001
 
 # Provide ZODB3 for those eggs that still care about ZODB3 compatibility -
 # for example wendelin.core. ZODB3 3.11 is just a dependency egg on _latest_

component/egg-patch/zodbpickle/utf8-by-default.patch

+--- a/src/zodbpickle/pickle_3.py	2022-05-04 17:14:14.001724804 +0000
++++ b/src/zodbpickle/pickle_3.py	2022-05-05 18:19:59.604856127 +0000
+@@ -788,7 +788,7 @@
+ class _Unpickler:
+ 
+     def __init__(self, file, *, fix_imports=True,
+-                 encoding="ASCII", errors="strict"):
++                 encoding="utf-8", errors="strict"):
+         """This takes a binary file for reading a pickle data stream.
+ 
+         The protocol version of the pickle is detected automatically, so no
+@@ -1479,9 +1479,10 @@
+                      encoding=encoding, errors=errors).load()
+ 
+ # Use the faster _pickle if possible
+-try:
+-    from zodbpickle._pickle import *
+-except ImportError:
++#try:
++#    from zodbpickle._pickle import *
++#except ImportError:
++if 1:
+     Pickler, Unpickler = _Pickler, _Unpickler
+     dump, dumps, load, loads = _dump, _dumps, _load, _loads
+