Since 7ae5ff82 (Port zodbtools to py3) zodbtools/py3 requires
pygolang!21 with which
running `zodb commit` wrt ZEO, as demonstrates by added
test_zodbcommit_cmd, yields:

    test/test_commit.py::test_zodbcommit_cmd[ZEO-!zext] Traceback (most recent call last):
      File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
        "__main__", fname, loader, pkg_name)
      File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
        exec code in run_globals
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 133, in <module>
        main()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodb.py", line 129, in main
        return command_module.main(argv)
      File "<decorator-gen-4>", line 2, in main
      File "/home/kirr/src/tools/go/pygolang/golang/__init__.py", line 125, in _
        return f(*argv, **kw)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 232, in main
        tid = zodbcommit(stor, at, txn)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 131, in zodbcommit
        _()
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 128, in _
        stor.store(obj.oid, current_serial(obj.oid), data, '', txn)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 87, in current_serial
        return _serial_at(stor, oid, at)
      File "/home/kirr/src/wendelin/z/zodbtools/zodbtools/zodbcommit.py", line 152, in _serial_at
        xdata = stor.loadBefore(oid, before)
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/ClientStorage.py", line 616, in loadBefore
        return self._server.load_before(oid, tid)
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/client.py", line 935, in load_before
        return self.io_call(self.load_before_co(oid, tid, self.timeout))
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/client.py", line 862, in io_call
        return future.result() if wait else future
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/futures.py", line 230, in result
        return Future.result(self)
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/futures.py", line 81, in result
        raise self._result
    ClientDisconnected: [Errno 104] Connection reset by peer
    FAILED()
    zeo.log:

    2024-07-16T21:13:45 ERROR ZEO.asyncio.server Can't deserialize message
    Traceback (most recent call last):
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/server.py", line 100, in message_received
        message_id, async_, name, args = self.decode(message)
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/marshal.py", line 119, in pickle_server_decode
        return unpickler.load()  # msgid, flags, name, args
      File "/home/kirr/src/wendelin/z/ZEO5/src/ZEO/asyncio/marshal.py", line 176, in server_find_global
        raise ImportError("Module not allowed: %s" % (module,))
    ImportError: Module not allowed: golang

This happens because zodbcommit.main and zodbdump.DumpReader use bstr to
handle binary data and further pass as IStorageTransactionInformation
instance to ZEO via its RPC, but ZEO server explicitly checks safe to
import modules and rejects golang.

One way to fix would be to patch ZEO to allow golang imports, but in
general it is better to follow the interface strictly and stay 100%
compatible with its users. That's why the fix converts fields covered by
IStorageTransactionInformation to exact types specified by that
interface to stay 100% compatible with users of the interface because on
py3 e.g. (b' ' == ' ') returns False and so we need to be careful to
provide .status as exactly str instead bytes, and do the similar for
other fields.